text: 
  /*
   * Copyright (C) Igor Sysoev
   * Copyright (C) Nginx, Inc.
   */
  
  
  #include <ngx_config.h>
  #include <ngx_core.h>
  #include <ngx_http.h>
  
  
  typedef struct {
      u_char    *name;
      uint32_t   method;
  } ngx_http_method_name_t;
  
  
  #define NGX_HTTP_REQUEST_BODY_FILE_OFF    0
  #define NGX_HTTP_REQUEST_BODY_FILE_ON     1
  #define NGX_HTTP_REQUEST_BODY_FILE_CLEAN  2
  
  
  static ngx_int_t ngx_http_core_find_location(ngx_http_request_t *r);
  static ngx_int_t ngx_http_core_find_static_location(ngx_http_request_t *r,
      ngx_http_location_tree_node_t *node);
  
  static ngx_int_t ngx_http_core_preconfiguration(ngx_conf_t *cf);
  static void *ngx_http_core_create_main_conf(ngx_conf_t *cf);
  static char *ngx_http_core_init_main_conf(ngx_conf_t *cf, void *conf);
  static void *ngx_http_core_create_srv_conf(ngx_conf_t *cf);
  static char *ngx_http_core_merge_srv_conf(ngx_conf_t *cf,
      void *parent, void *child);
  static void *ngx_http_core_create_loc_conf(ngx_conf_t *cf);
  static char *ngx_http_core_merge_loc_conf(ngx_conf_t *cf,
      void *parent, void *child);
  
  static char *ngx_http_core_server(ngx_conf_t *cf, ngx_command_t *cmd,
      void *dummy);
  static char *ngx_http_core_location(ngx_conf_t *cf, ngx_command_t *cmd,
      void *dummy);
  static ngx_int_t ngx_http_core_regex_location(ngx_conf_t *cf,
      ngx_http_core_loc_conf_t *clcf, ngx_str_t *regex, ngx_uint_t caseless);
  
  static char *ngx_http_core_types(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  static char *ngx_http_core_type(ngx_conf_t *cf, ngx_command_t *dummy,
      void *conf);
  
  static char *ngx_http_core_listen(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  static char *ngx_http_core_server_name(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  static char *ngx_http_core_root(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
  static char *ngx_http_core_limit_except(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  static char *ngx_http_core_directio(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  static char *ngx_http_core_error_page(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  static char *ngx_http_core_try_files(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  static char *ngx_http_core_open_file_cache(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  static char *ngx_http_core_error_log(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  static char *ngx_http_core_keepalive(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  static char *ngx_http_core_internal(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  static char *ngx_http_core_resolver(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  #if (NGX_HTTP_GZIP)
  static ngx_int_t ngx_http_gzip_accept_encoding(ngx_str_t *ae);
  static ngx_uint_t ngx_http_gzip_quantity(u_char *p, u_char *last);
  static char *ngx_http_gzip_disable(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  #endif
  #if (NGX_HAVE_OPENAT)
  static char *ngx_http_disable_symlinks(ngx_conf_t *cf, ngx_command_t *cmd,
      void *conf);
  #endif
  
  static char *ngx_http_core_lowat_check(ngx_conf_t *cf, void *post, void *data);
  static char *ngx_http_core_pool_size(ngx_conf_t *cf, void *post, void *data);
  
  static ngx_conf_post_t  ngx_http_core_lowat_post =
      { ngx_http_core_lowat_check };
  
  static ngx_conf_post_handler_pt  ngx_http_core_pool_size_p =
      ngx_http_core_pool_size;
  
  static ngx_conf_deprecated_t  ngx_conf_deprecated_optimize_server_names = {
      ngx_conf_deprecated, "optimize_server_names", "server_name_in_redirect"
  };
  
  static ngx_conf_deprecated_t  ngx_conf_deprecated_open_file_cache_retest = {
      ngx_conf_deprecated, "open_file_cache_retest", "open_file_cache_valid"
  };
  
  static ngx_conf_deprecated_t  ngx_conf_deprecated_satisfy_any = {
      ngx_conf_deprecated, "satisfy_any", "satisfy"
  };
  
  
  static ngx_conf_enum_t  ngx_http_core_request_body_in_file[] = {
      { ngx_string("off"), NGX_HTTP_REQUEST_BODY_FILE_OFF },
      { ngx_string("on"), NGX_HTTP_REQUEST_BODY_FILE_ON },
      { ngx_string("clean"), NGX_HTTP_REQUEST_BODY_FILE_CLEAN },
      { ngx_null_string, 0 }
  };
  
  
  #if (NGX_HAVE_FILE_AIO)
  
  static ngx_conf_enum_t  ngx_http_core_aio[] = {
      { ngx_string("off"), NGX_HTTP_AIO_OFF  },
      { ngx_string("on"), NGX_HTTP_AIO_ON },
  #if (NGX_HAVE_AIO_SENDFILE)
      { ngx_string("sendfile"), NGX_HTTP_AIO_SENDFILE },
  #endif
      { ngx_null_string, 0 }
  };
  
  #endif
  
  
  static ngx_conf_enum_t  ngx_http_core_satisfy[] = {
      { ngx_string("all"), NGX_HTTP_SATISFY_ALL },
      { ngx_string("any"), NGX_HTTP_SATISFY_ANY },
      { ngx_null_string, 0 }
  };
  
  
  static ngx_conf_enum_t  ngx_http_core_lingering_close[] = {
      { ngx_string("off"), NGX_HTTP_LINGERING_OFF },
      { ngx_string("on"), NGX_HTTP_LINGERING_ON },
      { ngx_string("always"), NGX_HTTP_LINGERING_ALWAYS },
      { ngx_null_string, 0 }
  };
  
  
  static ngx_conf_enum_t  ngx_http_core_if_modified_since[] = {
      { ngx_string("off"), NGX_HTTP_IMS_OFF },
      { ngx_string("exact"), NGX_HTTP_IMS_EXACT },
      { ngx_string("before"), NGX_HTTP_IMS_BEFORE },
      { ngx_null_string, 0 }
  };
  
  
  static ngx_conf_bitmask_t  ngx_http_core_keepalive_disable[] = {
      { ngx_string("none"), NGX_HTTP_KEEPALIVE_DISABLE_NONE },
      { ngx_string("msie6"), NGX_HTTP_KEEPALIVE_DISABLE_MSIE6 },
      { ngx_string("safari"), NGX_HTTP_KEEPALIVE_DISABLE_SAFARI },
      { ngx_null_string, 0 }
  };
  
  
  static ngx_path_init_t  ngx_http_client_temp_path = {
      ngx_string(NGX_HTTP_CLIENT_TEMP_PATH), { 0, 0, 0 }
  };
  
  
  #if (NGX_HTTP_GZIP)
  
  static ngx_conf_enum_t  ngx_http_gzip_http_version[] = {
      { ngx_string("1.0"), NGX_HTTP_VERSION_10 },
      { ngx_string("1.1"), NGX_HTTP_VERSION_11 },
      { ngx_null_string, 0 }
  };
  
  
  static ngx_conf_bitmask_t  ngx_http_gzip_proxied_mask[] = {
      { ngx_string("off"), NGX_HTTP_GZIP_PROXIED_OFF },
      { ngx_string("expired"), NGX_HTTP_GZIP_PROXIED_EXPIRED },
      { ngx_string("no-cache"), NGX_HTTP_GZIP_PROXIED_NO_CACHE },
      { ngx_string("no-store"), NGX_HTTP_GZIP_PROXIED_NO_STORE },
      { ngx_string("private"), NGX_HTTP_GZIP_PROXIED_PRIVATE },
      { ngx_string("no_last_modified"), NGX_HTTP_GZIP_PROXIED_NO_LM },
      { ngx_string("no_etag"), NGX_HTTP_GZIP_PROXIED_NO_ETAG },
      { ngx_string("auth"), NGX_HTTP_GZIP_PROXIED_AUTH },
      { ngx_string("any"), NGX_HTTP_GZIP_PROXIED_ANY },
      { ngx_null_string, 0 }
  };
  
  
  static ngx_str_t  ngx_http_gzip_no_cache = ngx_string("no-cache");
  static ngx_str_t  ngx_http_gzip_no_store = ngx_string("no-store");
  static ngx_str_t  ngx_http_gzip_private = ngx_string("private");
  
  #endif
  
  
  static ngx_command_t  ngx_http_core_commands[] = {
  
      { ngx_string("variables_hash_max_size"),
        NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_num_slot,
        NGX_HTTP_MAIN_CONF_OFFSET,
        offsetof(ngx_http_core_main_conf_t, variables_hash_max_size),
        NULL },
  
      { ngx_string("variables_hash_bucket_size"),
        NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_num_slot,
        NGX_HTTP_MAIN_CONF_OFFSET,
        offsetof(ngx_http_core_main_conf_t, variables_hash_bucket_size),
        NULL },
  
      { ngx_string("server_names_hash_max_size"),
        NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_num_slot,
        NGX_HTTP_MAIN_CONF_OFFSET,
        offsetof(ngx_http_core_main_conf_t, server_names_hash_max_size),
        NULL },
  
      { ngx_string("server_names_hash_bucket_size"),
        NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_num_slot,
        NGX_HTTP_MAIN_CONF_OFFSET,
        offsetof(ngx_http_core_main_conf_t, server_names_hash_bucket_size),
        NULL },
  
      { ngx_string("server"),
        NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_MULTI|NGX_CONF_NOARGS,
        ngx_http_core_server,
        0,
        0,
        NULL },
  
      { ngx_string("connection_pool_size"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_size_slot,
        NGX_HTTP_SRV_CONF_OFFSET,
        offsetof(ngx_http_core_srv_conf_t, connection_pool_size),
        &ngx_http_core_pool_size_p },
  
      { ngx_string("request_pool_size"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_size_slot,
        NGX_HTTP_SRV_CONF_OFFSET,
        offsetof(ngx_http_core_srv_conf_t, request_pool_size),
        &ngx_http_core_pool_size_p },
  
      { ngx_string("client_header_timeout"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_msec_slot,
        NGX_HTTP_SRV_CONF_OFFSET,
        offsetof(ngx_http_core_srv_conf_t, client_header_timeout),
        NULL },
  
      { ngx_string("client_header_buffer_size"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_size_slot,
        NGX_HTTP_SRV_CONF_OFFSET,
        offsetof(ngx_http_core_srv_conf_t, client_header_buffer_size),
        NULL },
  
      { ngx_string("large_client_header_buffers"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE2,
        ngx_conf_set_bufs_slot,
        NGX_HTTP_SRV_CONF_OFFSET,
        offsetof(ngx_http_core_srv_conf_t, large_client_header_buffers),
        NULL },
  
      { ngx_string("optimize_server_names"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, server_name_in_redirect),
        &ngx_conf_deprecated_optimize_server_names },
  
      { ngx_string("ignore_invalid_headers"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_SRV_CONF_OFFSET,
        offsetof(ngx_http_core_srv_conf_t, ignore_invalid_headers),
        NULL },
  
      { ngx_string("merge_slashes"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_SRV_CONF_OFFSET,
        offsetof(ngx_http_core_srv_conf_t, merge_slashes),
        NULL },
  
      { ngx_string("underscores_in_headers"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_SRV_CONF_OFFSET,
        offsetof(ngx_http_core_srv_conf_t, underscores_in_headers),
        NULL },
  
      { ngx_string("location"),
        NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE12,
        ngx_http_core_location,
        NGX_HTTP_SRV_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("listen"),
        NGX_HTTP_SRV_CONF|NGX_CONF_1MORE,
        ngx_http_core_listen,
        NGX_HTTP_SRV_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("server_name"),
        NGX_HTTP_SRV_CONF|NGX_CONF_1MORE,
        ngx_http_core_server_name,
        NGX_HTTP_SRV_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("types_hash_max_size"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_num_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, types_hash_max_size),
        NULL },
  
      { ngx_string("types_hash_bucket_size"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_num_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, types_hash_bucket_size),
        NULL },
  
      { ngx_string("types"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF
                                            |NGX_CONF_BLOCK|NGX_CONF_NOARGS,
        ngx_http_core_types,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("default_type"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_str_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, default_type),
        NULL },
  
      { ngx_string("root"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
                          |NGX_CONF_TAKE1,
        ngx_http_core_root,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("alias"),
        NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_http_core_root,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("limit_except"),
        NGX_HTTP_LOC_CONF|NGX_CONF_BLOCK|NGX_CONF_1MORE,
        ngx_http_core_limit_except,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("client_max_body_size"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_off_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, client_max_body_size),
        NULL },
  
      { ngx_string("client_body_buffer_size"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_size_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, client_body_buffer_size),
        NULL },
  
      { ngx_string("client_body_timeout"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_msec_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, client_body_timeout),
        NULL },
  
      { ngx_string("client_body_temp_path"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1234,
        ngx_conf_set_path_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, client_body_temp_path),
        NULL },
  
      { ngx_string("client_body_in_file_only"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_enum_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, client_body_in_file_only),
        &ngx_http_core_request_body_in_file },
  
      { ngx_string("client_body_in_single_buffer"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, client_body_in_single_buffer),
        NULL },
  
      { ngx_string("sendfile"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
                          |NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, sendfile),
        NULL },
  
      { ngx_string("sendfile_max_chunk"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_size_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, sendfile_max_chunk),
        NULL },
  
  #if (NGX_HAVE_FILE_AIO)
  
      { ngx_string("aio"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_enum_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, aio),
        &ngx_http_core_aio },
  
  #endif
  
      { ngx_string("read_ahead"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_size_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, read_ahead),
        NULL },
  
      { ngx_string("directio"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_http_core_directio,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("directio_alignment"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_off_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, directio_alignment),
        NULL },
  
      { ngx_string("tcp_nopush"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, tcp_nopush),
        NULL },
  
      { ngx_string("tcp_nodelay"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, tcp_nodelay),
        NULL },
  
      { ngx_string("send_timeout"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_msec_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, send_timeout),
        NULL },
  
      { ngx_string("send_lowat"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_size_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, send_lowat),
        &ngx_http_core_lowat_post },
  
      { ngx_string("postpone_output"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_size_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, postpone_output),
        NULL },
  
      { ngx_string("limit_rate"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
                          |NGX_CONF_TAKE1,
        ngx_conf_set_size_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, limit_rate),
        NULL },
  
      { ngx_string("limit_rate_after"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
                          |NGX_CONF_TAKE1,
        ngx_conf_set_size_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, limit_rate_after),
        NULL },
  
      { ngx_string("keepalive_timeout"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE12,
        ngx_http_core_keepalive,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("keepalive_requests"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_num_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, keepalive_requests),
        NULL },
  
      { ngx_string("keepalive_disable"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE12,
        ngx_conf_set_bitmask_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, keepalive_disable),
        &ngx_http_core_keepalive_disable },
  
      { ngx_string("satisfy"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_enum_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, satisfy),
        &ngx_http_core_satisfy },
  
      { ngx_string("satisfy_any"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, satisfy),
        &ngx_conf_deprecated_satisfy_any },
  
      { ngx_string("internal"),
        NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS,
        ngx_http_core_internal,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("lingering_close"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_enum_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, lingering_close),
        &ngx_http_core_lingering_close },
  
      { ngx_string("lingering_time"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_msec_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, lingering_time),
        NULL },
  
      { ngx_string("lingering_timeout"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_msec_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, lingering_timeout),
        NULL },
  
      { ngx_string("reset_timedout_connection"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, reset_timedout_connection),
        NULL },
  
      { ngx_string("server_name_in_redirect"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, server_name_in_redirect),
        NULL },
  
      { ngx_string("port_in_redirect"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, port_in_redirect),
        NULL },
  
      { ngx_string("msie_padding"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, msie_padding),
        NULL },
  
      { ngx_string("msie_refresh"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, msie_refresh),
        NULL },
  
      { ngx_string("log_not_found"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, log_not_found),
        NULL },
  
      { ngx_string("log_subrequest"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, log_subrequest),
        NULL },
  
      { ngx_string("recursive_error_pages"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, recursive_error_pages),
        NULL },
  
      { ngx_string("server_tokens"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, server_tokens),
        NULL },
  
      { ngx_string("if_modified_since"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_enum_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, if_modified_since),
        &ngx_http_core_if_modified_since },
  
      { ngx_string("max_ranges"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_num_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, max_ranges),
        NULL },
  
      { ngx_string("chunked_transfer_encoding"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, chunked_transfer_encoding),
        NULL },
  
      { ngx_string("etag"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, etag),
        NULL },
  
      { ngx_string("error_page"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
                          |NGX_CONF_2MORE,
        ngx_http_core_error_page,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("try_files"),
        NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_2MORE,
        ngx_http_core_try_files,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("post_action"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
                          |NGX_CONF_TAKE1,
        ngx_conf_set_str_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, post_action),
        NULL },
  
      { ngx_string("error_log"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
        ngx_http_core_error_log,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("open_file_cache"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE12,
        ngx_http_core_open_file_cache,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, open_file_cache),
        NULL },
  
      { ngx_string("open_file_cache_valid"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_sec_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, open_file_cache_valid),
        NULL },
  
      { ngx_string("open_file_cache_retest"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_sec_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, open_file_cache_valid),
        &ngx_conf_deprecated_open_file_cache_retest },
  
      { ngx_string("open_file_cache_min_uses"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_num_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, open_file_cache_min_uses),
        NULL },
  
      { ngx_string("open_file_cache_errors"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, open_file_cache_errors),
        NULL },
  
      { ngx_string("open_file_cache_events"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, open_file_cache_events),
        NULL },
  
      { ngx_string("resolver"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
        ngx_http_core_resolver,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL },
  
      { ngx_string("resolver_timeout"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_msec_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, resolver_timeout),
        NULL },
  
  #if (NGX_HTTP_GZIP)
  
      { ngx_string("gzip_vary"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
        ngx_conf_set_flag_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, gzip_vary),
        NULL },
  
      { ngx_string("gzip_http_version"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
        ngx_conf_set_enum_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, gzip_http_version),
        &ngx_http_gzip_http_version },
  
      { ngx_string("gzip_proxied"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
        ngx_conf_set_bitmask_slot,
        NGX_HTTP_LOC_CONF_OFFSET,
        offsetof(ngx_http_core_loc_conf_t, gzip_proxied),
        &ngx_http_gzip_proxied_mask },
  
      { ngx_string("gzip_disable"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
        ngx_http_gzip_disable,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL },
  
  #endif
  
  #if (NGX_HAVE_OPENAT)
  
      { ngx_string("disable_symlinks"),
        NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE12,
        ngx_http_disable_symlinks,
        NGX_HTTP_LOC_CONF_OFFSET,
        0,
        NULL },
  
  #endif
  
        ngx_null_command
  };
  
  
  static ngx_http_module_t  ngx_http_core_module_ctx = {
      ngx_http_core_preconfiguration,        /* preconfiguration */
      NULL,                                  /* postconfiguration */
  
      ngx_http_core_create_main_conf,        /* create main configuration */
      ngx_http_core_init_main_conf,          /* init main configuration */
  
      ngx_http_core_create_srv_conf,         /* create server configuration */
      ngx_http_core_merge_srv_conf,          /* merge server configuration */
  
      ngx_http_core_create_loc_conf,         /* create location configuration */
      ngx_http_core_merge_loc_conf           /* merge location configuration */
  };
  
  
  ngx_module_t  ngx_http_core_module = {
      NGX_MODULE_V1,
      &ngx_http_core_module_ctx,             /* module context */
      ngx_http_core_commands,                /* module directives */
      NGX_HTTP_MODULE,                       /* module type */
      NULL,                                  /* init master */
      NULL,                                  /* init module */
      NULL,                                  /* init process */
      NULL,                                  /* init thread */
      NULL,                                  /* exit thread */
      NULL,                                  /* exit process */
      NULL,                                  /* exit master */
      NGX_MODULE_V1_PADDING
  };
  
  
  ngx_str_t  ngx_http_core_get_method = { 3, (u_char *) "GET " };
  
  
  void
  ngx_http_handler(ngx_http_request_t *r)
  {
      ngx_http_core_main_conf_t  *cmcf;
  
      r->connection->log->action = NULL;
  
      r->connection->unexpected_eof = 0;
  
      if (!r->internal) {
          switch (r->headers_in.connection_type) {
          case 0:
              r->keepalive = (r->http_version > NGX_HTTP_VERSION_10);
              break;
  
          case NGX_HTTP_CONNECTION_CLOSE:
              r->keepalive = 0;
              break;
  
          case NGX_HTTP_CONNECTION_KEEP_ALIVE:
              r->keepalive = 1;
              break;
          }
  
          r->lingering_close = (r->headers_in.content_length_n > 0);
          r->phase_handler = 0;
  
      } else {
          cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
          r->phase_handler = cmcf->phase_engine.server_rewrite_index;
      }
  
      r->valid_location = 1;
  #if (NGX_HTTP_GZIP)
      r->gzip_tested = 0;
      r->gzip_ok = 0;
      r->gzip_vary = 0;
  #endif
  
      r->write_event_handler = ngx_http_core_run_phases;
      ngx_http_core_run_phases(r);
  }
  
  
  void
  ngx_http_core_run_phases(ngx_http_request_t *r)
  {
      ngx_int_t                   rc;
      ngx_http_phase_handler_t   *ph;
      ngx_http_core_main_conf_t  *cmcf;
  
      cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
  
      ph = cmcf->phase_engine.handlers;
  
      while (ph[r->phase_handler].checker) {
  
          rc = ph[r->phase_handler].checker(r, &ph[r->phase_handler]);
  
          if (rc == NGX_OK) {
              return;
          }
      }
  }
  
  
  ngx_int_t
  ngx_http_core_generic_phase(ngx_http_request_t *r, ngx_http_phase_handler_t *ph)
  {
      ngx_int_t  rc;
  
      /*
       * generic phase checker,
       * used by the post read and pre-access phases
       */
  
      ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                     "generic phase: %ui", r->phase_handler);
  
      rc = ph->handler(r);
  
      if (rc == NGX_OK) {
          r->phase_handler = ph->next;
          return NGX_AGAIN;
      }
  
      if (rc == NGX_DECLINED) {
          r->phase_handler++;
          return NGX_AGAIN;
      }
  
      if (rc == NGX_AGAIN || rc == NGX_DONE) {
          return NGX_OK;
      }
  
      /* rc == NGX_ERROR || rc == NGX_HTTP_...  */
  
      ngx_http_finalize_request(r, rc);
  
      return NGX_OK;
  }
  
  
  ngx_int_t
  ngx_http_core_rewrite_phase(ngx_http_request_t *r, ngx_http_phase_handler_t *ph)
  {
      ngx_int_t  rc;
  
      ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                     "rewrite phase: %ui", r->phase_handler);
  
      rc = ph->handler(r);
  
      if (rc == NGX_DECLINED) {
          r->phase_handler++;
          return NGX_AGAIN;
      }
  
      if (rc == NGX_DONE) {
          return NGX_OK;
      }
  
      /* NGX_OK, NGX_AGAIN, NGX_ERROR, NGX_HTTP_...  */
  
      ngx_http_finalize_request(r, rc);
  
      return NGX_OK;
  }
  
  
  ngx_int_t
  ngx_http_core_find_config_phase(ngx_http_request_t *r,
      ngx_http_phase_handler_t *ph)
  {
      u_char                    *p;
      size_t                     len;
      ngx_int_t                  rc;
      ngx_http_core_loc_conf_t  *clcf;
  
      r->content_handler = NULL;
      r->uri_changed = 0;
  
      rc = ngx_http_core_find_location(r);
  
      if (rc == NGX_ERROR) {
          ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
          return NGX_OK;
      }
  
      clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
  
      if (!r->internal && clcf->internal) {
          ngx_http_finalize_request(r, NGX_HTTP_NOT_FOUND);
          return NGX_OK;
      }
  
      ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                     "using configuration \"%s%V\"",
                     (clcf->noname ? "*" : (clcf->exact_match ? "=" : "")),
                     &clcf->name);
  
      ngx_http_update_location_config(r);
  
      ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                     "http cl:%O max:%O",
                     r->headers_in.content_length_n, clcf->client_max_body_size);
  
      if (r->headers_in.content_length_n != -1
          && !r->discard_body
          && clcf->client_max_body_size
          && clcf->client_max_body_size < r->headers_in.content_length_n)
      {
          ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                        "client intended to send too large body: %O bytes",
                        r->headers_in.content_length_n);
  
          (void) ngx_http_discard_request_body(r);
          ngx_http_finalize_request(r, NGX_HTTP_REQUEST_ENTITY_TOO_LARGE);
          return NGX_OK;
      }
  
      if (rc == NGX_DONE) {
          ngx_http_clear_location(r);
  
          r->headers_out.location = ngx_list_push(&r->headers_out.headers);
          if (r->headers_out.location == NULL) {
              ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
              return NGX_OK;
          }
  
          /*
           * we do not need to set the r->headers_out.location->hash and
           * r->headers_out.location->key fields
           */
  
          if (r->args.len == 0) {
              r->headers_out.location->value = clcf->name;
  
          } else {
              len = clcf->name.len + 1 + r->args.len;
              p = ngx_pnalloc(r->pool, len);
  
              if (p == NULL) {
                  ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
                  return NGX_OK;
              }
  
              r->headers_out.location->value.len = len;
              r->headers_out.location->value.data = p;
  
              p = ngx_cpymem(p, clcf->name.data, clcf->name.len);
              *p++ = '?';
              ngx_memcpy(p, r->args.data, r->args.len);
          }
  
          ngx_http_finalize_request(r, NGX_HTTP_MOVED_PERMANENTLY);
          return NGX_OK;
      }
  
      r->phase_handler++;
      return NGX_AGAIN;
  }
  
  
  ngx_int_t
  ngx_http_core_post_rewrite_phase(ngx_http_request_t *r,
      ngx_http_phase_handler_t *ph)
  {
      ngx_http_core_srv_conf_t  *cscf;
  
      ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                     "post rewrite phase: %ui", r->phase_handler);
  
      if (!r->uri_changed) {
          r->phase_handler++;
          return NGX_AGAIN;
      }
  
      ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                     "uri changes: %d", r->uri_changes);
  
      /*
       * gcc before 3.3 compiles the broken code for
       *     if (r->uri_changes-- == 0)
       * if the r->uri_changes is defined as
       *     unsigned  uri_changes:4
       */
  
      r->uri_changes--;
  
      if (r->uri_changes == 0) {
          ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                        "rewrite or internal redirection cycle "
                        "while processing \"%V\"", &r->uri);
  
          ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
          return NGX_OK;
      }
  
      r->phase_handler = ph->next;
  
      cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
      r->loc_conf = cscf->ctx->loc_conf;
  
      return NGX_AGAIN;
  }
  
  
  ngx_int_t
  ngx_http_core_access_phase(ngx_http_request_t *r, ngx_http_phase_handler_t *ph)
  {
      ngx_int_t                  rc;
      ngx_http_core_loc_conf_t  *clcf;
  
      if (r != r->main) {
          r->phase_handler = ph->next;
          return NGX_AGAIN;
      }
  
      ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                     "access phase: %ui", r->phase_handler);
  
      rc = ph->handler(r);
  
      if (rc == NGX_DECLINED) {
          r->phase_handler++;
          return NGX_AGAIN;
      }
  
      if (rc == NGX_AGAIN || rc == NGX_DONE) {
          return NGX_OK;
      }
  
      clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
  
      if (clcf->satisfy == NGX_HTTP_SATISFY_ALL) {
  
          if (rc == NGX_OK) {
              r->phase_handler++;
              return NGX_AGAIN;
          }
  
      } else {
          if (rc == NGX_OK) {
              r->access_code = 0;
  
              if (r->headers_out.www_authenticate) {
                  r->headers_out.www_authenticate->hash = 0;
              }
  
              r->phase_handler = ph->next;
              return NGX_AGAIN;
          }
  
          if (rc == NGX_HTTP_FORBIDDEN || rc == NGX_HTTP_UNAUTHORIZED) {
              r->access_code = rc;
  
              r->phase_handler++;
              return NGX_AGAIN;
          }
      }
  
      /* rc == NGX_ERROR || rc == NGX_HTTP_...  */
  
      ngx_http_finalize_request(r, rc);
      return NGX_OK;
  }
  
  
  ngx_int_t
  ngx_http_core_post_access_phase(ngx_http_request_t *r,
      ngx_http_phase_handler_t *ph)
  {
      ngx_int_t  access_code;
  
      ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                     "post access phase: %ui", r->phase_handler);
  
      access_code = r->access_code;
  
      if (access_code) {
          if (access_code == NGX_HTTP_FORBIDDEN) {
              ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                            "access forbidden by rule");
          }
  
          r->access_code = 0;
          ngx_http_finalize_request(r, access_code);
          return NGX_OK;
      }
  
      r->phase_handler++;
      return NGX_AGAIN;
  }
  
  
  ngx_int_t
  ngx_http_core_try_files_phase(ngx_http_request_t *r,
      ngx_http_phase_handler_t *ph)
  {
      size_t                        len, root, alias, reserve, allocated;
      u_char                       *p, *name;
      ngx_str_t                     path, args;
      ngx_uint_t                    test_dir;
      ngx_http_try_file_t          *tf;
      ngx_open_file_info_t          of;
      ngx_http_script_code_pt       code;
      ngx_http_script_engine_t      e;
      ngx_http_core_loc_conf_t     *clcf;
      ngx_http_script_len_code_pt   lcode;
  
      ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                     "try files phase: %ui", r->phase_handler);
  
      clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
  
      if (clcf->try_files == NULL) {
          r->phase_handler++;
          return NGX_AGAIN;
      }
  
      allocated = 0;
      root = 0;
      name = NULL;
      /* suppress MSVC warning */
      path.data = NULL;
  
      tf = clcf->try_files;
  
      alias = clcf->alias;
  
      for ( ;; ) {
  
          if (tf->lengths) {
              ngx_memzero(&e, sizeof(ngx_http_script_engine_t));
  
              e.ip = tf->lengths->elts;
              e.request = r;
  
              /* 1 is for terminating '\0' as in static names */
              len = 1;
  
              while (*(uintptr_t *) e.ip) {
                  lcode = *(ngx_http_script_len_code_pt *) e.ip;
                  len += lcode(&e);
              }
  
          } else {
              len = tf->name.len;
          }
  
          if (!alias) {
              reserve = len > r->uri.len ? len - r->uri.len : 0;
  
  #if (NGX_PCRE)
          } else if (clcf->regex) {
              reserve = len;
  #endif
  
          } else {
              reserve = len > r->uri.len - alias ? len - (r->uri.len - alias) : 0;
          }
  
          if (reserve > allocated || !allocated) {
  
              /* 16 bytes are preallocation */
              allocated = reserve + 16;
  
              if (ngx_http_map_uri_to_path(r, &path, &root, allocated) == NULL) {
                  ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
                  return NGX_OK;
              }
  
              name = path.data + root;
           }
  
          if (tf->values == NULL) {
  
              /* tf->name.len includes the terminating '\0' */
  
              ngx_memcpy(name, tf->name.data, tf->name.len);
  
              path.len = (name + tf->name.len - 1) - path.data;
  
          } else {
              e.ip = tf->values->elts;
              e.pos = name;
              e.flushed = 1;
  
              while (*(uintptr_t *) e.ip) {
                  code = *(ngx_http_script_code_pt *) e.ip;
                  code((ngx_http_script_engine_t *) &e);
              }
  
              path.len = e.pos - path.data;
  
              *e.pos = '\0';
  
              if (alias && ngx_strncmp(name, clcf->name.data, alias) == 0) {
                  ngx_memmove(name, name + alias, len - alias);
                  path.len -= alias;
              }
          }
  
          test_dir = tf->test_dir;
  
          tf++;
  
          ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                         "trying to use %s: \"%s\" \"%s\"",
                         test_dir ? "dir" : "file", name, path.data);
  
          if (tf->lengths == NULL && tf->name.len == 0) {
  
              if (tf->code) {
                  ngx_http_finalize_request(r, tf->code);
                  return NGX_OK;
              }
  
              path.len -= root;
              path.data += root;
  
              if (path.data[0] == '@') {
                  (void) ngx_http_named_location(r, &path);
  
              } else {
                  ngx_http_split_args(r, &path, &args);
  
                  (void) ngx_http_internal_redirect(r, &path, &args);
              }
  
              ngx_http_finalize_request(r, NGX_DONE);
              return NGX_OK;
          }
  
          ngx_memzero(&of, sizeof(ngx_open_file_info_t));
  
          of.read_ahead = clcf->read_ahead;
          of.directio = clcf->directio;
          of.valid = clcf->open_file_cache_valid;
          of.min_uses = clcf->open_file_cache_min_uses;
          of.test_only = 1;
          of.errors = clcf->open_file_cache_errors;
          of.events = clcf->open_file_cache_events;
  
          if (ngx_http_set_disable_symlinks(r, clcf, &path, &of) != NGX_OK) {
              ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
              return NGX_OK;
          }
  
          if (ngx_open_cached_file(clcf->open_file_cache, &path, &of, r->pool)
              != NGX_OK)
          {
              if (of.err != NGX_ENOENT
                  && of.err != NGX_ENOTDIR
                  && of.err != NGX_ENAMETOOLONG)
              {
                  ngx_log_error(NGX_LOG_CRIT, r->connection->log, of.err,
                                "%s \"%s\" failed", of.failed, path.data);
              }
  
              continue;
          }
  
          if (of.is_dir && !test_dir) {
              continue;
          }
  
          path.len -= root;
          path.data += root;
  
          if (!alias) {
              r->uri = path;
  
  #if (NGX_PCRE)
          } else if (clcf->regex) {
              if (!test_dir) {
                  r->uri = path;
                  r->add_uri_to_alias = 1;
              }
  #endif
          } else {
              r->uri.len = alias + path.len;
              r->uri.data = ngx_pnalloc(r->pool, r->uri.len);
              if (r->uri.data == NULL) {
                  ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
                  return NGX_OK;
              }
  
              p = ngx_copy(r->uri.data, clcf->name.data, alias);
              ngx_memcpy(p, name, path.len);
          }
  
          ngx_http_set_exten(r);
  
          ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                         "try file uri: \"%V\"", &r->uri);
  
          r->phase_handler++;
          return NGX_AGAIN;
      }
  
      /* not reached */
  }
  
  
  ngx_int_t
  ngx_http_core_content_phase(ngx_http_request_t *r,
      ngx_http_phase_handler_t *ph)
  {
      size_t     root;
      ngx_int_t  rc;
      ngx_str_t  path;
  
      if (r->content_handler) {
          r->write_event_handler = ngx_http_request_empty_handler;
          ngx_http_finalize_request(r, r->content_handler(r));
          return NGX_OK;
      }
  
      ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                     "content phase: %ui", r->phase_handler);
  
      rc = ph->handler(r);
  
      if (rc != NGX_DECLINED) {
          ngx_http_finalize_request(r, rc);
          return NGX_OK;
      }
  
      /* rc == NGX_DECLINED */
  
      ph++;
  
      if (ph->checker) {
          r->phase_handler++;
          return NGX_AGAIN;
      }
  
      /* no content handler was found */
  
      if (r->uri.data[r->uri.len - 1] == '/') {
  
          if (ngx_http_map_uri_to_path(r, &path, &root, 0) != NULL) {
              ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                            "directory index of \"%s\" is forbidden", path.data);
          }
  
          ngx_http_finalize_request(r, NGX_HTTP_FORBIDDEN);
          return NGX_OK;
      }
  
      ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "no handler found");
  
      ngx_http_finalize_request(r, NGX_HTTP_NOT_FOUND);
      return NGX_OK;
  }
  
  
  void
  ngx_http_update_location_config(ngx_http_request_t *r)
  {
      ngx_http_core_loc_conf_t  *clcf;
  
      clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
  
      if (r->method & clcf->limit_except) {
          r->loc_conf = clcf->limit_except_loc_conf;
          clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
      }
  
      if (r == r->main) {
          r->connection->log->file = clcf->error_log->file;
  
          if (!(r->connection->log->log_level & NGX_LOG_DEBUG_CONNECTION)) {
              r->connection->log->log_level = clcf->error_log->log_level;
          }
      }
  
      if ((ngx_io.flags & NGX_IO_SENDFILE) && clcf->sendfile) {
          r->connection->sendfile = 1;
  
      } else {
          r->connection->sendfile = 0;
      }
  
      if (clcf->client_body_in_file_only) {
          r->request_body_in_file_only = 1;
          r->request_body_in_persistent_file = 1;
          r->request_body_in_clean_file =
              clcf->client_body_in_file_only == NGX_HTTP_REQUEST_BODY_FILE_CLEAN;
          r->request_body_file_log_level = NGX_LOG_NOTICE;
  
      } else {
          r->request_body_file_log_level = NGX_LOG_WARN;
      }
  
      r->request_body_in_single_buf = clcf->client_body_in_single_buffer;
  
      if (r->keepalive) {
          if (clcf->keepalive_timeout == 0) {
              r->keepalive = 0;
  
          } else if (r->connection->requests >= clcf->keepalive_requests) {
              r->keepalive = 0;
  
          } else if (r->headers_in.msie6
                     && r->method == NGX_HTTP_POST
                     && (clcf->keepalive_disable
                         & NGX_HTTP_KEEPALIVE_DISABLE_MSIE6))
          {
              /*
               * MSIE may wait for some time if an response for
               * a POST request was sent over a keepalive connection
               */
              r->keepalive = 0;
  
          } else if (r->headers_in.safari
                     && (clcf->keepalive_disable
                         & NGX_HTTP_KEEPALIVE_DISABLE_SAFARI))
          {
              /*
               * Safari may send a POST request to a closed keepalive
               * connection and may stall for some time, see
               *     https://bugs.webkit.org/show_bug.cgi?id=5760
               */
              r->keepalive = 0;
          }
      }
  
      if (!clcf->tcp_nopush) {
          /* disable TCP_NOPUSH/TCP_CORK use */
          r->connection->tcp_nopush = NGX_TCP_NOPUSH_DISABLED;
      }
  
      if (r->limit_rate == 0) {
          r->limit_rate = clcf->limit_rate;
      }
  
      if (clcf->handler) {
          r->content_handler = clcf->handler;
      }
  }
  
  
  /*
   * NGX_OK       - exact or regex match
   * NGX_DONE     - auto redirect
   * NGX_AGAIN    - inclusive match
   * NGX_ERROR    - regex error
   * NGX_DECLINED - no match
   */
  
  static ngx_int_t
  ngx_http_core_find_location(ngx_http_request_t *r)
  {
      ngx_int_t                  rc;
      ngx_http_core_loc_conf_t  *pclcf;
  #if (NGX_PCRE)
      ngx_int_t                  n;
      ngx_uint_t                 noregex;
      ngx_http_core_loc_conf_t  *clcf, **clcfp;
  
      noregex = 0;
  #endif
  
      pclcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
  
      rc = ngx_http_core_find_static_location(r, pclcf->static_locations);
  
      if (rc == NGX_AGAIN) {
  
  #if (NGX_PCRE)
          clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
  
          noregex = clcf->noregex;
  #endif
  
          /* look up nested locations */
  
          rc = ngx_http_core_find_location(r);
      }
  
      if (rc == NGX_OK || rc == NGX_DONE) {
          return rc;
      }
  
      /* rc == NGX_DECLINED or rc == NGX_AGAIN in nested location */
  
  #if (NGX_PCRE)
  
      if (noregex == 0 && pclcf->regex_locations) {
  
          for (clcfp = pclcf->regex_locations; *clcfp; clcfp++) {
  
              ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                             "test location: ~ \"%V\"", &(*clcfp)->name);
  
              n = ngx_http_regex_exec(r, (*clcfp)->regex, &r->uri);
  
              if (n == NGX_OK) {
                  r->loc_conf = (*clcfp)->loc_conf;
  
                  /* look up nested locations */
  
                  rc = ngx_http_core_find_location(r);
  
                  return (rc == NGX_ERROR) ? rc : NGX_OK;
              }
  
              if (n == NGX_DECLINED) {
                  continue;
              }
  
              return NGX_ERROR;
          }
      }
  #endif
  
      return rc;
  }
  
  
  /*
   * NGX_OK       - exact match
   * NGX_DONE     - auto redirect
   * NGX_AGAIN    - inclusive match
   * NGX_DECLINED - no match
   */
  
  static ngx_int_t
  ngx_http_core_find_static_location(ngx_http_request_t *r,
      ngx_http_location_tree_node_t *node)
  {
      u_char     *uri;
      size_t      len, n;
      ngx_int_t   rc, rv;
  
      len = r->uri.len;
      uri = r->uri.data;
  
      rv = NGX_DECLINED;
  
      for ( ;; ) {
  
          if (node == NULL) {
              return rv;
          }
  
          ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                         "test location: \"%*s\"", node->len, node->name);
  
          n = (len <= (size_t) node->len) ? len : node->len;
  
          rc = ngx_filename_cmp(uri, node->name, n);
  
          if (rc != 0) {
              node = (rc < 0) ? node->left : node->right;
  
              continue;
          }
  
          if (len > (size_t) node->len) {
  
              if (node->inclusive) {
  
                  r->loc_conf = node->inclusive->loc_conf;
                  rv = NGX_AGAIN;
  
                  node = node->tree;
                  uri += n;
                  len -= n;
  
                  continue;
              }
  
              /* exact only */
  
              node = node->right;
  
              continue;
          }
  
          if (len == (size_t) node->len) {
  
              if (node->exact) {
                  r->loc_conf = node->exact->loc_conf;
                  return NGX_OK;
  
              } else {
                  r->loc_conf = node->inclusive->loc_conf;
                  return NGX_AGAIN;
              }
          }
  
          /* len < node->len */
  
          if (len + 1 == (size_t) node->len && node->auto_redirect) {
  
              r->loc_conf = (node->exact) ? node->exact->loc_conf:
                                            node->inclusive->loc_conf;
              rv = NGX_DONE;
          }
  
          node = node->left;
      }
  }
  
  
  void *
  ngx_http_test_content_type(ngx_http_request_t *r, ngx_hash_t *types_hash)
  {
      u_char      c, *lowcase;
      size_t      len;
      ngx_uint_t  i, hash;
  
      if (types_hash->size == 0) {
          return (void *) 4;
      }
  
      if (r->headers_out.content_type.len == 0) {
          return NULL;
      }
  
      len = r->headers_out.content_type_len;
  
      if (r->headers_out.content_type_lowcase == NULL) {
  
          lowcase = ngx_pnalloc(r->pool, len);
          if (lowcase == NULL) {
              return NULL;
          }
  
          r->headers_out.content_type_lowcase = lowcase;
  
          hash = 0;
  
          for (i = 0; i < len; i++) {
              c = ngx_tolower(r->headers_out.content_type.data[i]);
              hash = ngx_hash(hash, c);
              lowcase[i] = c;
          }
  
          r->headers_out.content_type_hash = hash;
      }
  
      return ngx_hash_find(types_hash, r->headers_out.content_type_hash,
                           r->headers_out.content_type_lowcase, len);
  }
  
  
  ngx_int_t
  ngx_http_set_content_type(ngx_http_request_t *r)
  {
      u_char                     c, *exten;
      ngx_str_t                 *type;
      ngx_uint_t                 i, hash;
      ngx_http_core_loc_conf_t  *clcf;
  
      if (r->headers_out.content_type.len) {
          return NGX_OK;
      }
  
      clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
  
      if (r->exten.len) {
  
          hash = 0;
  
          for (i = 0; i < r->exten.len; i++) {
              c = r->exten.data[i];
  
              if (c >= 'A' && c <= 'Z') {
  
                  exten = ngx_pnalloc(r->pool, r->exten.len);
                  if (exten == NULL) {
                      return NGX_ERROR;
                  }
  
                  hash = ngx_hash_strlow(exten, r->exten.data, r->exten.len);
  
                  r->exten.data = exten;
  
                  break;
              }
  
              hash = ngx_hash(hash, c);
          }
  
          type = ngx_hash_find(&clcf->types_hash, hash,
                               r->exten.data, r->exten.len);
  
          if (type) {
              r->headers_out.content_type_len = type->len;
              r->headers_out.content_type = *type;
  
              return NGX_OK;
          }
      }
  
      r->headers_out.content_type_len = clcf->default_type.len;
      r->headers_out.content_type = clcf->default_type;
  
      return NGX_OK;
  }
  
  
  void
  ngx_http_set_exten(ngx_http_request_t *r)
  {
      ngx_int_t  i;
  
      ngx_str_null(&r->exten);
  
      for (i = r->uri.len - 1; i > 1; i--) {
          if (r->uri.data[i] == '.' && r->uri.data[i - 1] != '/') {
  
              r->exten.len = r->uri.len - i - 1;
              r->exten.data = &r->uri.data[i + 1];
  
              return;
  
          } else if (r->uri.data[i] == '/') {
              return;
          }
      }
  
      return;
  }
  
  
  ngx_int_t
  ngx_http_set_etag(ngx_http_request_t *r)
  {
      ngx_table_elt_t           *etag;
      ngx_http_core_loc_conf_t  *clcf;
      
      clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
   
      if (!clcf->etag) {
          return NGX_OK;
      }
  
      etag = ngx_list_push(&r->headers_out.headers);
      if (etag == NULL) {
          return NGX_ERROR;
      }
  
      etag->hash = 1;
      ngx_str_set(&etag->key, "ETag");
  
      etag->value.data = ngx_pnalloc(r->pool, NGX_OFF_T_LEN + NGX_TIME_T_LEN + 3);
      if (etag->value.data == NULL) {
          return NGX_ERROR;
      }
  
      etag->value.len = ngx_sprintf(etag->value.data, "\"%xT-%xO\"",
                                    r->headers_out.last_modified_time,
                                    r->headers_out.content_length_n)
                        - etag->value.data;
  
      r->headers_out.etag = etag;
  
      return NGX_OK;
  }
  
  
  ngx_int_t
  ngx_http_send_response(ngx_http_request_t *r, ngx_uint_t status,
      ngx_str_t *ct, ngx_http_complex_value_t *cv)
  {
      ngx_int_t     rc;
      ngx_str_t     val;
      ngx_buf_t    *b;
      ngx_chain_t   out;
  
      if (ngx_http_discard_request_body(r) != NGX_OK) {
          return NGX_HTTP_INTERNAL_SERVER_ERROR;
      }
  
      r->headers_out.status = status;
  
      if (ngx_http_complex_value(r, cv, &val) != NGX_OK) {
          return NGX_HTTP_INTERNAL_SERVER_ERROR;
      }
  
      if (status == NGX_HTTP_MOVED_PERMANENTLY
          || status == NGX_HTTP_MOVED_TEMPORARILY
          || status == NGX_HTTP_SEE_OTHER
          || status == NGX_HTTP_TEMPORARY_REDIRECT)
      {
          ngx_http_clear_location(r);
  
          r->headers_out.location = ngx_list_push(&r->headers_out.headers);
          if (r->headers_out.location == NULL) {
              return NGX_HTTP_INTERNAL_SERVER_ERROR;
          }
  
          r->headers_out.location->hash = 1;
          ngx_str_set(&r->headers_out.location->key, "Location");
          r->headers_out.location->value = val;
  
          return status;
      }
  
      r->headers_out.content_length_n = val.len;
  
      if (ct) {
          r->headers_out.content_type_len = ct->len;
          r->headers_out.content_type = *ct;
  
      } else {
          if (ngx_http_set_content_type(r) != NGX_OK) {
              return NGX_HTTP_INTERNAL_SERVER_ERROR;
          }
      }
  
      if (r->method == NGX_HTTP_HEAD || (r != r->main && val.len == 0)) {
          return ngx_http_send_header(r);
      }
  
      b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
      if (b == NULL) {
          return NGX_HTTP_INTERNAL_SERVER_ERROR;
      }
  
      b->pos = val.data;
      b->last = val.data + val.len;
      b->memory = val.len ? 1 : 0;
      b->last_buf = (r == r->main) ? 1 : 0;
      b->last_in_chain = 1;
  
      out.buf = b;
      out.next = NULL;
  
      rc = ngx_http_send_header(r);
  
      if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
          return rc;
      }
  
      return ngx_http_output_filter(r, &out);
  }
  
  
  ngx_int_t
  ngx_http_send_header(ngx_http_request_t *r)
  {
      if (r->err_status) {
          r->headers_out.status = r->err_status;
          r->headers_out.status_line.len = 0;
      }
  
      return ngx_http_top_header_filter(r);
  }
  
  
  ngx_int_t
  ngx_http_output_filter(ngx_http_request_t *r, ngx_chain_t *in)
  {
      ngx_int_t          rc;
      ngx_connection_t  *c;
  
      c = r->connection;
  
      ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
                     "http output filter \"%V?%V\"", &r->uri, &r->args);
  
      rc = ngx_http_top_body_filter(r, in);
  
      if (rc == NGX_ERROR) {
          /* NGX_ERROR may be returned by any filter */
          c->error = 1;
      }
  
      return rc;
  }
  
  
  u_char *
  ngx_http_map_uri_to_path(ngx_http_request_t *r, ngx_str_t *path,
      size_t *root_length, size_t reserved)
  {
      u_char                    *last;
      size_t                     alias;
      ngx_http_core_loc_conf_t  *clcf;
  
      clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
  
      alias = clcf->alias;
  
      if (alias && !r->valid_location) {
          ngx_log_error(NGX_LOG_ALERT, r->connection->log, 0,
                        "\"alias\" cannot be used in location \"%V\" "
                        "where URI was rewritten", &clcf->name);
          return NULL;
      }
  
      if (clcf->root_lengths == NULL) {
  
          *root_length = clcf->root.len;
  
          path->len = clcf->root.len + reserved + r->uri.len - alias + 1;
  
          path->data = ngx_pnalloc(r->pool, path->len);
          if (path->data == NULL) {
              return NULL;
          }
  
          last = ngx_copy(path->data, clcf->root.data, clcf->root.len);
  
      } else {
  
  #if (NGX_PCRE)
          ngx_uint_t  captures;
  
          captures = alias && clcf->regex;
  
          reserved += captures ? r->add_uri_to_alias ? r->uri.len + 1 : 1
                               : r->uri.len - alias + 1;
  #else
          reserved += r->uri.len - alias + 1;
  #endif
  
          if (ngx_http_script_run(r, path, clcf->root_lengths->elts, reserved,
                                  clcf->root_values->elts)
              == NULL)
          {
              return NULL;
          }
  
          if (ngx_conf_full_name((ngx_cycle_t *) ngx_cycle, path, 0) != NGX_OK) {
              return NULL;
          }
  
          *root_length = path->len - reserved;
          last = path->data + *root_length;
  
  #if (NGX_PCRE)
          if (captures) {
              if (!r->add_uri_to_alias) {
                  *last = '\0';
                  return last;
              }
  
              alias = 0;
          }
  #endif
      }
  
      last = ngx_cpystrn(last, r->uri.data + alias, r->uri.len - alias + 1);
  
      return last;
  }
  
  
  ngx_int_t
  ngx_http_auth_basic_user(ngx_http_request_t *r)
  {
      ngx_str_t   auth, encoded;
      ngx_uint_t  len;
  
      if (r->headers_in.user.len == 0 && r->headers_in.user.data != NULL) {
          return NGX_DECLINED;
      }
  
      if (r->headers_in.authorization == NULL) {
          r->headers_in.user.data = (u_char *) "";
          return NGX_DECLINED;
      }
  
      encoded = r->headers_in.authorization->value;
  
      if (encoded.len < sizeof("Basic ") - 1
          || ngx_strncasecmp(encoded.data, (u_char *) "Basic ",
                             sizeof("Basic ") - 1)
             != 0)
      {
          r->headers_in.user.data = (u_char *) "";
          return NGX_DECLINED;
      }
  
      encoded.len -= sizeof("Basic ") - 1;
      encoded.data += sizeof("Basic ") - 1;
  
      while (encoded.len && encoded.data[0] == ' ') {
          encoded.len--;
          encoded.data++;
      }
  
      if (encoded.len == 0) {
          r->headers_in.user.data = (u_char *) "";
          return NGX_DECLINED;
      }
  
      auth.len = ngx_base64_decoded_length(encoded.len);
      auth.data = ngx_pnalloc(r->pool, auth.len + 1);
      if (auth.data == NULL) {
          return NGX_ERROR;
      }
  
      if (ngx_decode_base64(&auth, &encoded) != NGX_OK) {
          r->headers_in.user.data = (u_char *) "";
          return NGX_DECLINED;
      }
  
      auth.data[auth.len] = '\0';
  
      for (len = 0; len < auth.len; len++) {
          if (auth.data[len] == ':') {
              break;
          }
      }
  
      if (len == 0 || len == auth.len) {
          r->headers_in.user.data = (u_char *) "";
          return NGX_DECLINED;
      }
  
      r->headers_in.user.len = len;
      r->headers_in.user.data = auth.data;
      r->headers_in.passwd.len = auth.len - len - 1;
      r->headers_in.passwd.data = &auth.data[len + 1];
  
      return NGX_OK;
  }
  
  
  #if (NGX_HTTP_GZIP)
  
  ngx_int_t
  ngx_http_gzip_ok(ngx_http_request_t *r)
  {
      time_t                     date, expires;
      ngx_uint_t                 p;
      ngx_array_t               *cc;
      ngx_table_elt_t           *e, *d, *ae;
      ngx_http_core_loc_conf_t  *clcf;
  
      r->gzip_tested = 1;
  
      if (r != r->main) {
          return NGX_DECLINED;
      }
  
      ae = r->headers_in.accept_encoding;
      if (ae == NULL) {
          return NGX_DECLINED;
      }
  
      if (ae->value.len < sizeof("gzip") - 1) {
          return NGX_DECLINED;
      }
  
      /*
       * test first for the most common case "gzip,...":
       *   MSIE:    "gzip, deflate"
       *   Firefox: "gzip,deflate"
       *   Chrome:  "gzip,deflate,sdch"
       *   Safari:  "gzip, deflate"
       *   Opera:   "gzip, deflate"
       */
  
      if (ngx_memcmp(ae->value.data, "gzip,", 5) != 0
          && ngx_http_gzip_accept_encoding(&ae->value) != NGX_OK)
      {
          return NGX_DECLINED;
      }
  
      clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
  
      if (r->headers_in.msie6 && clcf->gzip_disable_msie6) {
          return NGX_DECLINED;
      }
  
      if (r->http_version < clcf->gzip_http_version) {
          return NGX_DECLINED;
      }
  
      if (r->headers_in.via == NULL) {
          goto ok;
      }
  
      p = clcf->gzip_proxied;
  
      if (p & NGX_HTTP_GZIP_PROXIED_OFF) {
          return NGX_DECLINED;
      }
  
      if (p & NGX_HTTP_GZIP_PROXIED_ANY) {
          goto ok;
      }
  
      if (r->headers_in.authorization && (p & NGX_HTTP_GZIP_PROXIED_AUTH)) {
          goto ok;
      }
  
      e = r->headers_out.expires;
  
      if (e) {
  
          if (!(p & NGX_HTTP_GZIP_PROXIED_EXPIRED)) {
              return NGX_DECLINED;
          }
  
          expires = ngx_http_parse_time(e->value.data, e->value.len);
          if (expires == NGX_ERROR) {
              return NGX_DECLINED;
          }
  
          d = r->headers_out.date;
  
          if (d) {
              date = ngx_http_parse_time(d->value.data, d->value.len);
              if (date == NGX_ERROR) {
                  return NGX_DECLINED;
              }
  
          } else {
              date = ngx_time();
          }
  
          if (expires < date) {
              goto ok;
          }
  
          return NGX_DECLINED;
      }
  
      cc = &r->headers_out.cache_control;
  
      if (cc->elts) {
  
          if ((p & NGX_HTTP_GZIP_PROXIED_NO_CACHE)
              && ngx_http_parse_multi_header_lines(cc, &ngx_http_gzip_no_cache,
                                                   NULL)
                 >= 0)
          {
              goto ok;
          }
  
          if ((p & NGX_HTTP_GZIP_PROXIED_NO_STORE)
              && ngx_http_parse_multi_header_lines(cc, &ngx_http_gzip_no_store,
                                                   NULL)
                 >= 0)
          {
              goto ok;
          }
  
          if ((p & NGX_HTTP_GZIP_PROXIED_PRIVATE)
              && ngx_http_parse_multi_header_lines(cc, &ngx_http_gzip_private,
                                                   NULL)
                 >= 0)
          {
              goto ok;
          }
  
          return NGX_DECLINED;
      }
  
      if ((p & NGX_HTTP_GZIP_PROXIED_NO_LM) && r->headers_out.last_modified) {
          return NGX_DECLINED;
      }
  
      if ((p & NGX_HTTP_GZIP_PROXIED_NO_ETAG) && r->headers_out.etag) {
          return NGX_DECLINED;
      }
  
  ok:
  
  #if (NGX_PCRE)
  
      if (clcf->gzip_disable && r->headers_in.user_agent) {
  
          if (ngx_regex_exec_array(clcf->gzip_disable,
                                   &r->headers_in.user_agent->value,
                                   r->connection->log)
              != NGX_DECLINED)
          {
              return NGX_DECLINED;
          }
      }
  
  #endif
  
      r->gzip_ok = 1;
  
      return NGX_OK;
  }
  
  
  /*
   * gzip is enabled for the following quantities:
   *     "gzip; q=0.001" ... "gzip; q=1.000"
   * gzip is disabled for the following quantities:
   *     "gzip; q=0" ... "gzip; q=0.000", and for any invalid cases
   */
  
  static ngx_int_t
  ngx_http_gzip_accept_encoding(ngx_str_t *ae)
  {
      u_char  *p, *start, *last;
  
      start = ae->data;
      last = start + ae->len;
  
      for ( ;; ) {
          p = ngx_strcasestrn(start, "gzip", 4 - 1);
          if (p == NULL) {
              return NGX_DECLINED;
          }
  
          if (p == start || (*(p - 1) == ',' || *(p - 1) == ' ')) {
              break;
          }
  
          start = p + 4;
      }
  
      p += 4;
  
      while (p < last) {
          switch(*p++) {
          case ',':
              return NGX_OK;
          case ';':
              goto quantity;
          case ' ':
              continue;
          default:
              return NGX_DECLINED;
          }
      }
  
      return NGX_OK;
  
  quantity:
  
      while (p < last) {
          switch(*p++) {
          case 'q':
          case 'Q':
              goto equal;
          case ' ':
              continue;
          default:
              return NGX_DECLINED;
          }
      }
  
      return NGX_OK;
  
  equal:
  
      if (p + 2 > last || *p++ != '=') {
          return NGX_DECLINED;
      }
  
      if (ngx_http_gzip_quantity(p, last) == 0) {
          return NGX_DECLINED;
      }
  
      return NGX_OK;
  }
  
  
  ngx_uint_t
  ngx_http_gzip_quantity(u_char *p, u_char *last)
  {
      u_char      c;
      ngx_uint_t  n, q;
  
      c = *p++;
  
      if (c != '0' && c != '1') {
          return 0;
      }
  
      q = (c - '0') * 100;
  
      if (p == last) {
          return q;
      }
  
      c = *p++;
  
      if (c == ',' || c == ' ') {
          return q;
      }
  
      if (c != '.') {
          return 0;
      }
  
      n = 0;
  
      while (p < last) {
          c = *p++;
  
          if (c == ',' || c == ' ') {
              break;
          }
  
          if (c >= '0' && c <= '9') {
              q += c - '0';
              n++;
              continue;
          }
  
          return 0;
      }
  
      if (q > 100 || n > 3) {
          return 0;
      }
  
      return q;
  }
  
  #endif
  
  
  ngx_int_t
  ngx_http_subrequest(ngx_http_request_t *r,
      ngx_str_t *uri, ngx_str_t *args, ngx_http_request_t **psr,
      ngx_http_post_subrequest_t *ps, ngx_uint_t flags)
  {
      ngx_time_t                    *tp;
      ngx_connection_t              *c;
      ngx_http_request_t            *sr;
      ngx_http_core_srv_conf_t      *cscf;
      ngx_http_postponed_request_t  *pr, *p;
  
      r->main->subrequests--;
  
      if (r->main->subrequests == 0) {
          ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                        "subrequests cycle while processing \"%V\"", uri);
          r->main->subrequests = 1;
          return NGX_ERROR;
      }
  
      sr = ngx_pcalloc(r->pool, sizeof(ngx_http_request_t));
      if (sr == NULL) {
          return NGX_ERROR;
      }
  
      sr->signature = NGX_HTTP_MODULE;
  
      c = r->connection;
      sr->connection = c;
  
      sr->ctx = ngx_pcalloc(r->pool, sizeof(void *) * ngx_http_max_module);
      if (sr->ctx == NULL) {
          return NGX_ERROR;
      }
  
      if (ngx_list_init(&sr->headers_out.headers, r->pool, 20,
                        sizeof(ngx_table_elt_t))
          != NGX_OK)
      {
          return NGX_ERROR;
      }
  
      cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
      sr->main_conf = cscf->ctx->main_conf;
      sr->srv_conf = cscf->ctx->srv_conf;
      sr->loc_conf = cscf->ctx->loc_conf;
  
      sr->pool = r->pool;
  
      sr->headers_in = r->headers_in;
  
      ngx_http_clear_content_length(sr);
      ngx_http_clear_accept_ranges(sr);
      ngx_http_clear_last_modified(sr);
  
      sr->request_body = r->request_body;
  
      sr->method = NGX_HTTP_GET;
      sr->http_version = r->http_version;
  
      sr->request_line = r->request_line;
      sr->uri = *uri;
  
      if (args) {
          sr->args = *args;
      }
  
      ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
                     "http subrequest \"%V?%V\"", uri, &sr->args);
  
      sr->subrequest_in_memory = (flags & NGX_HTTP_SUBREQUEST_IN_MEMORY) != 0;
      sr->waited = (flags & NGX_HTTP_SUBREQUEST_WAITED) != 0;
  
      sr->unparsed_uri = r->unparsed_uri;
      sr->method_name = ngx_http_core_get_method;
      sr->http_protocol = r->http_protocol;
  
      ngx_http_set_exten(sr);
  
      sr->main = r->main;
      sr->parent = r;
      sr->post_subrequest = ps;
      sr->read_event_handler = ngx_http_request_empty_handler;
      sr->write_event_handler = ngx_http_handler;
  
      if (c->data == r && r->postponed == NULL) {
          c->data = sr;
      }
  
      sr->variables = r->variables;
  
      sr->log_handler = r->log_handler;
  
      pr = ngx_palloc(r->pool, sizeof(ngx_http_postponed_request_t));
      if (pr == NULL) {
          return NGX_ERROR;
      }
  
      pr->request = sr;
      pr->out = NULL;
      pr->next = NULL;
  
      if (r->postponed) {
          for (p = r->postponed; p->next; p = p->next) { /* void */ }
          p->next = pr;
  
      } else {
          r->postponed = pr;
      }
  
      sr->internal = 1;
  
      sr->discard_body = r->discard_body;
      sr->expect_tested = 1;
      sr->main_filter_need_in_memory = r->main_filter_need_in_memory;
  
      sr->uri_changes = NGX_HTTP_MAX_URI_CHANGES + 1;
  
      tp = ngx_timeofday();
      sr->start_sec = tp->sec;
      sr->start_msec = tp->msec;
  
      r->main->count++;
  
      *psr = sr;
  
      return ngx_http_post_request(sr, NULL);
  }
  
  
  ngx_int_t
  ngx_http_internal_redirect(ngx_http_request_t *r,
      ngx_str_t *uri, ngx_str_t *args)
  {
      ngx_http_core_srv_conf_t  *cscf;
  
      r->uri_changes--;
  
      if (r->uri_changes == 0) {
          ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                        "rewrite or internal redirection cycle "
                        "while internally redirecting to \"%V\"", uri);
  
          r->main->count++;
          ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
          return NGX_DONE;
      }
  
      r->uri = *uri;
  
      if (args) {
          r->args = *args;
  
      } else {
          ngx_str_null(&r->args);
      }
  
      ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                     "internal redirect: \"%V?%V\"", uri, &r->args);
  
      ngx_http_set_exten(r);
  
      /* clear the modules contexts */
      ngx_memzero(r->ctx, sizeof(void *) * ngx_http_max_module);
  
      cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
      r->loc_conf = cscf->ctx->loc_conf;
  
      ngx_http_update_location_config(r);
  
  #if (NGX_HTTP_CACHE)
      r->cache = NULL;
  #endif
  
      r->internal = 1;
      r->valid_unparsed_uri = 0;
      r->add_uri_to_alias = 0;
      r->main->count++;
  
      ngx_http_handler(r);
  
      return NGX_DONE;
  }
  
  
  ngx_int_t
  ngx_http_named_location(ngx_http_request_t *r, ngx_str_t *name)
  {
      ngx_http_core_srv_conf_t    *cscf;
      ngx_http_core_loc_conf_t   **clcfp;
      ngx_http_core_main_conf_t   *cmcf;
  
      r->main->count++;
      r->uri_changes--;
  
      if (r->uri_changes == 0) {
          ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                        "rewrite or internal redirection cycle "
                        "while redirect to named location \"%V\"", name);
  
          ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
          return NGX_DONE;
      }
  
      cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
  
      if (cscf->named_locations) {
  
          for (clcfp = cscf->named_locations; *clcfp; clcfp++) {
  
              ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                             "test location: \"%V\"", &(*clcfp)->name);
  
              if (name->len != (*clcfp)->name.len
                  || ngx_strncmp(name->data, (*clcfp)->name.data, name->len) != 0)
              {
                  continue;
              }
  
              ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                             "using location: %V \"%V?%V\"",
                             name, &r->uri, &r->args);
  
              r->internal = 1;
              r->content_handler = NULL;
              r->uri_changed = 0;
              r->loc_conf = (*clcfp)->loc_conf;
  
              /* clear the modules contexts */
              ngx_memzero(r->ctx, sizeof(void *) * ngx_http_max_module);
  
              ngx_http_update_location_config(r);
  
              cmcf = ngx_http_get_module_main_conf(r, ngx_http_core_module);
  
              r->phase_handler = cmcf->phase_engine.location_rewrite_index;
  
              r->write_event_handler = ngx_http_core_run_phases;
              ngx_http_core_run_phases(r);
  
              return NGX_DONE;
          }
      }
  
      ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
                    "could not find named location \"%V\"", name);
  
      ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
  
      return NGX_DONE;
  }
  
  
  ngx_http_cleanup_t *
  ngx_http_cleanup_add(ngx_http_request_t *r, size_t size)
  {
      ngx_http_cleanup_t  *cln;
  
      r = r->main;
  
      cln = ngx_palloc(r->pool, sizeof(ngx_http_cleanup_t));
      if (cln == NULL) {
          return NULL;
      }
  
      if (size) {
          cln->data = ngx_palloc(r->pool, size);
          if (cln->data == NULL) {
              return NULL;
          }
  
      } else {
          cln->data = NULL;
      }
  
      cln->handler = NULL;
      cln->next = r->cleanup;
  
      r->cleanup = cln;
  
      ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                     "http cleanup add: %p", cln);
  
      return cln;
  }
  
  
  ngx_int_t
  ngx_http_set_disable_symlinks(ngx_http_request_t *r,
      ngx_http_core_loc_conf_t *clcf, ngx_str_t *path, ngx_open_file_info_t *of)
  {
  #if (NGX_HAVE_OPENAT)
      u_char     *p;
      ngx_str_t   from;
  
      of->disable_symlinks = clcf->disable_symlinks;
  
      if (clcf->disable_symlinks_from == NULL) {
          return NGX_OK;
      }
  
      if (ngx_http_complex_value(r, clcf->disable_symlinks_from, &from)
          != NGX_OK)
      {
          return NGX_ERROR;
      }
  
      if (from.len == 0
          || from.len > path->len
          || ngx_memcmp(path->data, from.data, from.len) != 0)
      {
          return NGX_OK;
      }
  
      if (from.len == path->len) {
          of->disable_symlinks = NGX_DISABLE_SYMLINKS_OFF;
          return NGX_OK;
      }
  
      p = path->data + from.len;
  
      if (*p == '/') {
          of->disable_symlinks_from = from.len;
          return NGX_OK;
      }
  
      p--;
  
      if (*p == '/') {
          of->disable_symlinks_from = from.len - 1;
      }
  #endif
  
      return NGX_OK;
  }
  
  
  ngx_int_t
  ngx_http_get_forwarded_addr(ngx_http_request_t *r, ngx_addr_t *addr,
      u_char *xff, size_t xfflen, ngx_array_t *proxies, int recursive)
  {
      u_char           *p;
      in_addr_t         inaddr;
      ngx_addr_t        paddr;
      ngx_cidr_t       *cidr;
      ngx_uint_t        family, i;
  #if (NGX_HAVE_INET6)
      ngx_uint_t        n;
      struct in6_addr  *inaddr6;
  #endif
  
  #if (NGX_SUPPRESS_WARN)
      inaddr = 0;
  #if (NGX_HAVE_INET6)
      inaddr6 = NULL;
  #endif
  #endif
  
      family = addr->sockaddr->sa_family;
  
      if (family == AF_INET) {
          inaddr = ((struct sockaddr_in *) addr->sockaddr)->sin_addr.s_addr;
      }
  
  #if (NGX_HAVE_INET6)
      else if (family == AF_INET6) {
          inaddr6 = &((struct sockaddr_in6 *) addr->sockaddr)->sin6_addr;
  
          if (IN6_IS_ADDR_V4MAPPED(inaddr6)) {
              family = AF_INET;
              inaddr = *(in_addr_t *) &inaddr6->s6_addr[12];
          }
      }
  #endif
  
      for (cidr = proxies->elts, i = 0; i < proxies->nelts; i++) {
          if (cidr[i].family != family) {
              goto next;
          }
  
          switch (family) {
  
  #if (NGX_HAVE_INET6)
          case AF_INET6:
              for (n = 0; n < 16; n++) {
                  if ((inaddr6->s6_addr[n] & cidr[i].u.in6.mask.s6_addr[n])
                      != cidr[i].u.in6.addr.s6_addr[n])
                  {
                      goto next;
                  }
              }
              break;
  #endif
  
  #if (NGX_HAVE_UNIX_DOMAIN)
          case AF_UNIX:
              break;
  #endif
  
          default: /* AF_INET */
              if ((inaddr & cidr[i].u.in.mask) != cidr[i].u.in.addr) {
                  goto next;
              }
              break;
          }
  
          for (p = xff + xfflen - 1; p > xff; p--, xfflen--) {
              if (*p != ' ' && *p != ',') {
                  break;
              }
          }
  
          for ( /* void */ ; p > xff; p--) {
              if (*p == ' ' || *p == ',') {
                  p++;
                  break;
              }
          }
  
          if (ngx_parse_addr(r->pool, &paddr, p, xfflen - (p - xff)) != NGX_OK) {
              return NGX_DECLINED;
          }
  
          *addr = paddr;
  
          if (recursive && p > xff) {
              (void) ngx_http_get_forwarded_addr(r, addr, xff, p - 1 - xff,
                                                 proxies, 1);
          }
  
          return NGX_OK;
  
      next:
          continue;
      }
  
      return NGX_DECLINED;
  }
  
  
  static char *
  ngx_http_core_server(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy)
  {
      char                        *rv;
      void                        *mconf;
      ngx_uint_t                   i;
      ngx_conf_t                   pcf;
      ngx_http_module_t           *module;
      struct sockaddr_in          *sin;
      ngx_http_conf_ctx_t         *ctx, *http_ctx;
      ngx_http_listen_opt_t        lsopt;
      ngx_http_core_srv_conf_t    *cscf, **cscfp;
      ngx_http_core_main_conf_t   *cmcf;
  
      ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t));
      if (ctx == NULL) {
          return NGX_CONF_ERROR;
      }
  
      http_ctx = cf->ctx;
      ctx->main_conf = http_ctx->main_conf;
  
      /* the server{}'s srv_conf */
  
      ctx->srv_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
      if (ctx->srv_conf == NULL) {
          return NGX_CONF_ERROR;
      }
  
      /* the server{}'s loc_conf */
  
      ctx->loc_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
      if (ctx->loc_conf == NULL) {
          return NGX_CONF_ERROR;
      }
  
      for (i = 0; ngx_modules[i]; i++) {
          if (ngx_modules[i]->type != NGX_HTTP_MODULE) {
              continue;
          }
  
          module = ngx_modules[i]->ctx;
  
          if (module->create_srv_conf) {
              mconf = module->create_srv_conf(cf);
              if (mconf == NULL) {
                  return NGX_CONF_ERROR;
              }
  
              ctx->srv_conf[ngx_modules[i]->ctx_index] = mconf;
          }
  
          if (module->create_loc_conf) {
              mconf = module->create_loc_conf(cf);
              if (mconf == NULL) {
                  return NGX_CONF_ERROR;
              }
  
              ctx->loc_conf[ngx_modules[i]->ctx_index] = mconf;
          }
      }
  
  
      /* the server configuration context */
  
      cscf = ctx->srv_conf[ngx_http_core_module.ctx_index];
      cscf->ctx = ctx;
  
  
      cmcf = ctx->main_conf[ngx_http_core_module.ctx_index];
  
      cscfp = ngx_array_push(&cmcf->servers);
      if (cscfp == NULL) {
          return NGX_CONF_ERROR;
      }
  
      *cscfp = cscf;
  
  
      /* parse inside server{} */
  
      pcf = *cf;
      cf->ctx = ctx;
      cf->cmd_type = NGX_HTTP_SRV_CONF;
  
      rv = ngx_conf_parse(cf, NULL);
  
      *cf = pcf;
  
      if (rv == NGX_CONF_OK && !cscf->listen) {
          ngx_memzero(&lsopt, sizeof(ngx_http_listen_opt_t));
  
          sin = &lsopt.u.sockaddr_in;
  
          sin->sin_family = AF_INET;
  #if (NGX_WIN32)
          sin->sin_port = htons(80);
  #else
          sin->sin_port = htons((getuid() == 0) ? 80 : 8000);
  #endif
          sin->sin_addr.s_addr = INADDR_ANY;
  
          lsopt.socklen = sizeof(struct sockaddr_in);
  
          lsopt.backlog = NGX_LISTEN_BACKLOG;
          lsopt.rcvbuf = -1;
          lsopt.sndbuf = -1;
  #if (NGX_HAVE_SETFIB)
          lsopt.setfib = -1;
  #endif
          lsopt.wildcard = 1;
  
          (void) ngx_sock_ntop(&lsopt.u.sockaddr, lsopt.addr,
                               NGX_SOCKADDR_STRLEN, 1);
  
          if (ngx_http_add_listen(cf, cscf, &lsopt) != NGX_OK) {
              return NGX_CONF_ERROR;
          }
      }
  
      return rv;
  }
  
  
  static char *
  ngx_http_core_location(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy)
  {
      char                      *rv;
      u_char                    *mod;
      size_t                     len;
      ngx_str_t                 *value, *name;
      ngx_uint_t                 i;
      ngx_conf_t                 save;
      ngx_http_module_t         *module;
      ngx_http_conf_ctx_t       *ctx, *pctx;
      ngx_http_core_loc_conf_t  *clcf, *pclcf;
  
      ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t));
      if (ctx == NULL) {
          return NGX_CONF_ERROR;
      }
  
      pctx = cf->ctx;
      ctx->main_conf = pctx->main_conf;
      ctx->srv_conf = pctx->srv_conf;
  
      ctx->loc_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
      if (ctx->loc_conf == NULL) {
          return NGX_CONF_ERROR;
      }
  
      for (i = 0; ngx_modules[i]; i++) {
          if (ngx_modules[i]->type != NGX_HTTP_MODULE) {
              continue;
          }
  
          module = ngx_modules[i]->ctx;
  
          if (module->create_loc_conf) {
              ctx->loc_conf[ngx_modules[i]->ctx_index] =
                                                     module->create_loc_conf(cf);
              if (ctx->loc_conf[ngx_modules[i]->ctx_index] == NULL) {
                   return NGX_CONF_ERROR;
              }
          }
      }
  
      clcf = ctx->loc_conf[ngx_http_core_module.ctx_index];
      clcf->loc_conf = ctx->loc_conf;
  
      value = cf->args->elts;
  
      if (cf->args->nelts == 3) {
  
          len = value[1].len;
          mod = value[1].data;
          name = &value[2];
  
          if (len == 1 && mod[0] == '=') {
  
              clcf->name = *name;
              clcf->exact_match = 1;
  
          } else if (len == 2 && mod[0] == '^' && mod[1] == '~') {
  
              clcf->name = *name;
              clcf->noregex = 1;
  
          } else if (len == 1 && mod[0] == '~') {
  
              if (ngx_http_core_regex_location(cf, clcf, name, 0) != NGX_OK) {
                  return NGX_CONF_ERROR;
              }
  
          } else if (len == 2 && mod[0] == '~' && mod[1] == '*') {
  
              if (ngx_http_core_regex_location(cf, clcf, name, 1) != NGX_OK) {
                  return NGX_CONF_ERROR;
              }
  
          } else {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "invalid location modifier \"%V\"", &value[1]);
              return NGX_CONF_ERROR;
          }
  
      } else {
  
          name = &value[1];
  
          if (name->data[0] == '=') {
  
              clcf->name.len = name->len - 1;
              clcf->name.data = name->data + 1;
              clcf->exact_match = 1;
  
          } else if (name->data[0] == '^' && name->data[1] == '~') {
  
              clcf->name.len = name->len - 2;
              clcf->name.data = name->data + 2;
              clcf->noregex = 1;
  
          } else if (name->data[0] == '~') {
  
              name->len--;
              name->data++;
  
              if (name->data[0] == '*') {
  
                  name->len--;
                  name->data++;
  
                  if (ngx_http_core_regex_location(cf, clcf, name, 1) != NGX_OK) {
                      return NGX_CONF_ERROR;
                  }
  
              } else {
                  if (ngx_http_core_regex_location(cf, clcf, name, 0) != NGX_OK) {
                      return NGX_CONF_ERROR;
                  }
              }
  
          } else {
  
              clcf->name = *name;
  
              if (name->data[0] == '@') {
                  clcf->named = 1;
              }
          }
      }
  
      pclcf = pctx->loc_conf[ngx_http_core_module.ctx_index];
  
      if (pclcf->name.len) {
  
          /* nested location */
  
  #if 0
          clcf->prev_location = pclcf;
  #endif
  
          if (pclcf->exact_match) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "location \"%V\" cannot be inside "
                                 "the exact location \"%V\"",
                                 &clcf->name, &pclcf->name);
              return NGX_CONF_ERROR;
          }
  
          if (pclcf->named) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "location \"%V\" cannot be inside "
                                 "the named location \"%V\"",
                                 &clcf->name, &pclcf->name);
              return NGX_CONF_ERROR;
          }
  
          if (clcf->named) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "named location \"%V\" can be "
                                 "on the server level only",
                                 &clcf->name);
              return NGX_CONF_ERROR;
          }
  
          len = pclcf->name.len;
  
  #if (NGX_PCRE)
          if (clcf->regex == NULL
              && ngx_strncmp(clcf->name.data, pclcf->name.data, len) != 0)
  #else
          if (ngx_strncmp(clcf->name.data, pclcf->name.data, len) != 0)
  #endif
          {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "location \"%V\" is outside location \"%V\"",
                                 &clcf->name, &pclcf->name);
              return NGX_CONF_ERROR;
          }
      }
  
      if (ngx_http_add_location(cf, &pclcf->locations, clcf) != NGX_OK) {
          return NGX_CONF_ERROR;
      }
  
      save = *cf;
      cf->ctx = ctx;
      cf->cmd_type = NGX_HTTP_LOC_CONF;
  
      rv = ngx_conf_parse(cf, NULL);
  
      *cf = save;
  
      return rv;
  }
  
  
  static ngx_int_t
  ngx_http_core_regex_location(ngx_conf_t *cf, ngx_http_core_loc_conf_t *clcf,
      ngx_str_t *regex, ngx_uint_t caseless)
  {
  #if (NGX_PCRE)
      ngx_regex_compile_t  rc;
      u_char               errstr[NGX_MAX_CONF_ERRSTR];
  
      ngx_memzero(&rc, sizeof(ngx_regex_compile_t));
  
      rc.pattern = *regex;
      rc.err.len = NGX_MAX_CONF_ERRSTR;
      rc.err.data = errstr;
  
  #if (NGX_HAVE_CASELESS_FILESYSTEM)
      rc.options = NGX_REGEX_CASELESS;
  #else
      rc.options = caseless;
  #endif
  
      clcf->regex = ngx_http_regex_compile(cf, &rc);
      if (clcf->regex == NULL) {
          return NGX_ERROR;
      }
  
      clcf->name = *regex;
  
      return NGX_OK;
  
  #else
  
      ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                         "using regex \"%V\" requires PCRE library",
                         regex);
      return NGX_ERROR;
  
  #endif
  }
  
  
  static char *
  ngx_http_core_types(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_loc_conf_t *clcf = conf;
  
      char        *rv;
      ngx_conf_t   save;
  
      if (clcf->types == NULL) {
          clcf->types = ngx_array_create(cf->pool, 64, sizeof(ngx_hash_key_t));
          if (clcf->types == NULL) {
              return NGX_CONF_ERROR;
          }
      }
  
      save = *cf;
      cf->handler = ngx_http_core_type;
      cf->handler_conf = conf;
  
      rv = ngx_conf_parse(cf, NULL);
  
      *cf = save;
  
      return rv;
  }
  
  
  static char *
  ngx_http_core_type(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
  {
      ngx_http_core_loc_conf_t *clcf = conf;
  
      ngx_str_t       *value, *content_type, *old, file;
      ngx_uint_t       i, n, hash;
      ngx_hash_key_t  *type;
  
      value = cf->args->elts;
  
      if (ngx_strcmp(value[0].data, "include") == 0) {
          if (cf->args->nelts != 2) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "invalid number of arguments"
                                 " in \"include\" directive");
              return NGX_CONF_ERROR;
          }
          file = value[1];
  
          if (ngx_conf_full_name(cf->cycle, &file, 1) != NGX_OK) {
              return NGX_CONF_ERROR;
          }
  
          ngx_log_debug1(NGX_LOG_DEBUG_CORE, cf->log, 0, "include %s", file.data);
  
          return ngx_conf_parse(cf, &file);
      }
  
      content_type = ngx_palloc(cf->pool, sizeof(ngx_str_t));
      if (content_type == NULL) {
          return NGX_CONF_ERROR;
      }
  
      *content_type = value[0];
  
      for (i = 1; i < cf->args->nelts; i++) {
  
          hash = ngx_hash_strlow(value[i].data, value[i].data, value[i].len);
  
          type = clcf->types->elts;
          for (n = 0; n < clcf->types->nelts; n++) {
              if (ngx_strcmp(value[i].data, type[n].key.data) == 0) {
                  old = type[n].value;
                  type[n].value = content_type;
  
                  ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
                                     "duplicate extension \"%V\", "
                                     "content type: \"%V\", "
                                     "previous content type: \"%V\"",
                                     &value[i], content_type, old);
                  goto next;
              }
          }
  
  
          type = ngx_array_push(clcf->types);
          if (type == NULL) {
              return NGX_CONF_ERROR;
          }
  
          type->key = value[i];
          type->key_hash = hash;
          type->value = content_type;
  
      next:
          continue;
      }
  
      return NGX_CONF_OK;
  }
  
  
  static ngx_int_t
  ngx_http_core_preconfiguration(ngx_conf_t *cf)
  {
      return ngx_http_variables_add_core_vars(cf);
  }
  
  
  static void *
  ngx_http_core_create_main_conf(ngx_conf_t *cf)
  {
      ngx_http_core_main_conf_t  *cmcf;
  
      cmcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_core_main_conf_t));
      if (cmcf == NULL) {
          return NULL;
      }
  
      if (ngx_array_init(&cmcf->servers, cf->pool, 4,
                         sizeof(ngx_http_core_srv_conf_t *))
          != NGX_OK)
      {
          return NULL;
      }
  
      cmcf->server_names_hash_max_size = NGX_CONF_UNSET_UINT;
      cmcf->server_names_hash_bucket_size = NGX_CONF_UNSET_UINT;
  
      cmcf->variables_hash_max_size = NGX_CONF_UNSET_UINT;
      cmcf->variables_hash_bucket_size = NGX_CONF_UNSET_UINT;
  
      return cmcf;
  }
  
  
  static char *
  ngx_http_core_init_main_conf(ngx_conf_t *cf, void *conf)
  {
      ngx_http_core_main_conf_t *cmcf = conf;
  
      if (cmcf->server_names_hash_max_size == NGX_CONF_UNSET_UINT) {
          cmcf->server_names_hash_max_size = 512;
      }
  
      if (cmcf->server_names_hash_bucket_size == NGX_CONF_UNSET_UINT) {
          cmcf->server_names_hash_bucket_size = ngx_cacheline_size;
      }
  
      cmcf->server_names_hash_bucket_size =
              ngx_align(cmcf->server_names_hash_bucket_size, ngx_cacheline_size);
  
  
      if (cmcf->variables_hash_max_size == NGX_CONF_UNSET_UINT) {
          cmcf->variables_hash_max_size = 512;
      }
  
      if (cmcf->variables_hash_bucket_size == NGX_CONF_UNSET_UINT) {
          cmcf->variables_hash_bucket_size = 64;
      }
  
      cmcf->variables_hash_bucket_size =
                 ngx_align(cmcf->variables_hash_bucket_size, ngx_cacheline_size);
  
      if (cmcf->ncaptures) {
          cmcf->ncaptures = (cmcf->ncaptures + 1) * 3;
      }
  
      return NGX_CONF_OK;
  }
  
  
  static void *
  ngx_http_core_create_srv_conf(ngx_conf_t *cf)
  {
      ngx_http_core_srv_conf_t  *cscf;
  
      cscf = ngx_pcalloc(cf->pool, sizeof(ngx_http_core_srv_conf_t));
      if (cscf == NULL) {
          return NULL;
      }
  
      /*
       * set by ngx_pcalloc():
       *
       *     conf->client_large_buffers.num = 0;
       */
  
      if (ngx_array_init(&cscf->server_names, cf->temp_pool, 4,
                         sizeof(ngx_http_server_name_t))
          != NGX_OK)
      {
          return NULL;
      }
  
      cscf->connection_pool_size = NGX_CONF_UNSET_SIZE;
      cscf->request_pool_size = NGX_CONF_UNSET_SIZE;
      cscf->client_header_timeout = NGX_CONF_UNSET_MSEC;
      cscf->client_header_buffer_size = NGX_CONF_UNSET_SIZE;
      cscf->ignore_invalid_headers = NGX_CONF_UNSET;
      cscf->merge_slashes = NGX_CONF_UNSET;
      cscf->underscores_in_headers = NGX_CONF_UNSET;
  
      return cscf;
  }
  
  
  static char *
  ngx_http_core_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
  {
      ngx_http_core_srv_conf_t *prev = parent;
      ngx_http_core_srv_conf_t *conf = child;
  
      ngx_str_t                name;
      ngx_http_server_name_t  *sn;
  
      /* TODO: it does not merge, it inits only */
  
      ngx_conf_merge_size_value(conf->connection_pool_size,
                                prev->connection_pool_size, 256);
      ngx_conf_merge_size_value(conf->request_pool_size,
                                prev->request_pool_size, 4096);
      ngx_conf_merge_msec_value(conf->client_header_timeout,
                                prev->client_header_timeout, 60000);
      ngx_conf_merge_size_value(conf->client_header_buffer_size,
                                prev->client_header_buffer_size, 1024);
      ngx_conf_merge_bufs_value(conf->large_client_header_buffers,
                                prev->large_client_header_buffers,
                                4, 8192);
  
      if (conf->large_client_header_buffers.size < conf->connection_pool_size) {
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "the \"large_client_header_buffers\" size must be "
                             "equal to or greater than \"connection_pool_size\"");
          return NGX_CONF_ERROR;
      }
  
      ngx_conf_merge_value(conf->ignore_invalid_headers,
                                prev->ignore_invalid_headers, 1);
  
      ngx_conf_merge_value(conf->merge_slashes, prev->merge_slashes, 1);
  
      ngx_conf_merge_value(conf->underscores_in_headers,
                                prev->underscores_in_headers, 0);
  
      if (conf->server_names.nelts == 0) {
          /* the array has 4 empty preallocated elements, so push cannot fail */
          sn = ngx_array_push(&conf->server_names);
  #if (NGX_PCRE)
          sn->regex = NULL;
  #endif
          sn->server = conf;
          ngx_str_set(&sn->name, "");
      }
  
      sn = conf->server_names.elts;
      name = sn[0].name;
  
  #if (NGX_PCRE)
      if (sn->regex) {
          name.len++;
          name.data--;
      } else
  #endif
  
      if (name.data[0] == '.') {
          name.len--;
          name.data++;
      }
  
      conf->server_name.len = name.len;
      conf->server_name.data = ngx_pstrdup(cf->pool, &name);
      if (conf->server_name.data == NULL) {
          return NGX_CONF_ERROR;
      }
  
      return NGX_CONF_OK;
  }
  
  
  static void *
  ngx_http_core_create_loc_conf(ngx_conf_t *cf)
  {
      ngx_http_core_loc_conf_t  *clcf;
  
      clcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_core_loc_conf_t));
      if (clcf == NULL) {
          return NULL;
      }
  
      /*
       * set by ngx_pcalloc():
       *
       *     clcf->root = { 0, NULL };
       *     clcf->limit_except = 0;
       *     clcf->post_action = { 0, NULL };
       *     clcf->types = NULL;
       *     clcf->default_type = { 0, NULL };
       *     clcf->error_log = NULL;
       *     clcf->error_pages = NULL;
       *     clcf->try_files = NULL;
       *     clcf->client_body_path = NULL;
       *     clcf->regex = NULL;
       *     clcf->exact_match = 0;
       *     clcf->auto_redirect = 0;
       *     clcf->alias = 0;
       *     clcf->gzip_proxied = 0;
       *     clcf->keepalive_disable = 0;
       */
  
      clcf->client_max_body_size = NGX_CONF_UNSET;
      clcf->client_body_buffer_size = NGX_CONF_UNSET_SIZE;
      clcf->client_body_timeout = NGX_CONF_UNSET_MSEC;
      clcf->satisfy = NGX_CONF_UNSET_UINT;
      clcf->if_modified_since = NGX_CONF_UNSET_UINT;
      clcf->max_ranges = NGX_CONF_UNSET_UINT;
      clcf->client_body_in_file_only = NGX_CONF_UNSET_UINT;
      clcf->client_body_in_single_buffer = NGX_CONF_UNSET;
      clcf->internal = NGX_CONF_UNSET;
      clcf->sendfile = NGX_CONF_UNSET;
      clcf->sendfile_max_chunk = NGX_CONF_UNSET_SIZE;
  #if (NGX_HAVE_FILE_AIO)
      clcf->aio = NGX_CONF_UNSET;
  #endif
      clcf->read_ahead = NGX_CONF_UNSET_SIZE;
      clcf->directio = NGX_CONF_UNSET;
      clcf->directio_alignment = NGX_CONF_UNSET;
      clcf->tcp_nopush = NGX_CONF_UNSET;
      clcf->tcp_nodelay = NGX_CONF_UNSET;
      clcf->send_timeout = NGX_CONF_UNSET_MSEC;
      clcf->send_lowat = NGX_CONF_UNSET_SIZE;
      clcf->postpone_output = NGX_CONF_UNSET_SIZE;
      clcf->limit_rate = NGX_CONF_UNSET_SIZE;
      clcf->limit_rate_after = NGX_CONF_UNSET_SIZE;
      clcf->keepalive_timeout = NGX_CONF_UNSET_MSEC;
      clcf->keepalive_header = NGX_CONF_UNSET;
      clcf->keepalive_requests = NGX_CONF_UNSET_UINT;
      clcf->lingering_close = NGX_CONF_UNSET_UINT;
      clcf->lingering_time = NGX_CONF_UNSET_MSEC;
      clcf->lingering_timeout = NGX_CONF_UNSET_MSEC;
      clcf->resolver_timeout = NGX_CONF_UNSET_MSEC;
      clcf->reset_timedout_connection = NGX_CONF_UNSET;
      clcf->server_name_in_redirect = NGX_CONF_UNSET;
      clcf->port_in_redirect = NGX_CONF_UNSET;
      clcf->msie_padding = NGX_CONF_UNSET;
      clcf->msie_refresh = NGX_CONF_UNSET;
      clcf->log_not_found = NGX_CONF_UNSET;
      clcf->log_subrequest = NGX_CONF_UNSET;
      clcf->recursive_error_pages = NGX_CONF_UNSET;
      clcf->server_tokens = NGX_CONF_UNSET;
      clcf->chunked_transfer_encoding = NGX_CONF_UNSET;
      clcf->etag = NGX_CONF_UNSET;
      clcf->types_hash_max_size = NGX_CONF_UNSET_UINT;
      clcf->types_hash_bucket_size = NGX_CONF_UNSET_UINT;
  
      clcf->open_file_cache = NGX_CONF_UNSET_PTR;
      clcf->open_file_cache_valid = NGX_CONF_UNSET;
      clcf->open_file_cache_min_uses = NGX_CONF_UNSET_UINT;
      clcf->open_file_cache_errors = NGX_CONF_UNSET;
      clcf->open_file_cache_events = NGX_CONF_UNSET;
  
  #if (NGX_HTTP_GZIP)
      clcf->gzip_vary = NGX_CONF_UNSET;
      clcf->gzip_http_version = NGX_CONF_UNSET_UINT;
  #if (NGX_PCRE)
      clcf->gzip_disable = NGX_CONF_UNSET_PTR;
  #endif
      clcf->gzip_disable_msie6 = 3;
  #if (NGX_HTTP_DEGRADATION)
      clcf->gzip_disable_degradation = 3;
  #endif
  #endif
  
  #if (NGX_HAVE_OPENAT)
      clcf->disable_symlinks = NGX_CONF_UNSET_UINT;
      clcf->disable_symlinks_from = NGX_CONF_UNSET_PTR;
  #endif
  
      return clcf;
  }
  
  
  static ngx_str_t  ngx_http_core_text_html_type = ngx_string("text/html");
  static ngx_str_t  ngx_http_core_image_gif_type = ngx_string("image/gif");
  static ngx_str_t  ngx_http_core_image_jpeg_type = ngx_string("image/jpeg");
  
  static ngx_hash_key_t  ngx_http_core_default_types[] = {
      { ngx_string("html"), 0, &ngx_http_core_text_html_type },
      { ngx_string("gif"), 0, &ngx_http_core_image_gif_type },
      { ngx_string("jpg"), 0, &ngx_http_core_image_jpeg_type },
      { ngx_null_string, 0, NULL }
  };
  
  
  static char *
  ngx_http_core_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
  {
      ngx_http_core_loc_conf_t *prev = parent;
      ngx_http_core_loc_conf_t *conf = child;
  
      ngx_uint_t        i;
      ngx_hash_key_t   *type;
      ngx_hash_init_t   types_hash;
  
      if (conf->root.data == NULL) {
  
          conf->alias = prev->alias;
          conf->root = prev->root;
          conf->root_lengths = prev->root_lengths;
          conf->root_values = prev->root_values;
  
          if (prev->root.data == NULL) {
              ngx_str_set(&conf->root, "html");
  
              if (ngx_conf_full_name(cf->cycle, &conf->root, 0) != NGX_OK) {
                  return NGX_CONF_ERROR;
              }
          }
      }
  
      if (conf->post_action.data == NULL) {
          conf->post_action = prev->post_action;
      }
  
      ngx_conf_merge_uint_value(conf->types_hash_max_size,
                                prev->types_hash_max_size, 1024);
  
      ngx_conf_merge_uint_value(conf->types_hash_bucket_size,
                                prev->types_hash_bucket_size,
                                ngx_cacheline_size);
  
      conf->types_hash_bucket_size = ngx_align(conf->types_hash_bucket_size,
                                               ngx_cacheline_size);
  
      /*
       * the special handling of the "types" directive in the "http" section
       * to inherit the http's conf->types_hash to all servers
       */
  
      if (prev->types && prev->types_hash.buckets == NULL) {
  
          types_hash.hash = &prev->types_hash;
          types_hash.key = ngx_hash_key_lc;
          types_hash.max_size = conf->types_hash_max_size;
          types_hash.bucket_size = conf->types_hash_bucket_size;
          types_hash.name = "types_hash";
          types_hash.pool = cf->pool;
          types_hash.temp_pool = NULL;
  
          if (ngx_hash_init(&types_hash, prev->types->elts, prev->types->nelts)
              != NGX_OK)
          {
              return NGX_CONF_ERROR;
          }
      }
  
      if (conf->types == NULL) {
          conf->types = prev->types;
          conf->types_hash = prev->types_hash;
      }
  
      if (conf->types == NULL) {
          conf->types = ngx_array_create(cf->pool, 3, sizeof(ngx_hash_key_t));
          if (conf->types == NULL) {
              return NGX_CONF_ERROR;
          }
  
          for (i = 0; ngx_http_core_default_types[i].key.len; i++) {
              type = ngx_array_push(conf->types);
              if (type == NULL) {
                  return NGX_CONF_ERROR;
              }
  
              type->key = ngx_http_core_default_types[i].key;
              type->key_hash =
                         ngx_hash_key_lc(ngx_http_core_default_types[i].key.data,
                                         ngx_http_core_default_types[i].key.len);
              type->value = ngx_http_core_default_types[i].value;
          }
      }
  
      if (conf->types_hash.buckets == NULL) {
  
          types_hash.hash = &conf->types_hash;
          types_hash.key = ngx_hash_key_lc;
          types_hash.max_size = conf->types_hash_max_size;
          types_hash.bucket_size = conf->types_hash_bucket_size;
          types_hash.name = "types_hash";
          types_hash.pool = cf->pool;
          types_hash.temp_pool = NULL;
  
          if (ngx_hash_init(&types_hash, conf->types->elts, conf->types->nelts)
              != NGX_OK)
          {
              return NGX_CONF_ERROR;
          }
      }
  
      if (conf->error_log == NULL) {
          if (prev->error_log) {
              conf->error_log = prev->error_log;
          } else {
              conf->error_log = &cf->cycle->new_log;
          }
      }
  
      if (conf->error_pages == NULL && prev->error_pages) {
          conf->error_pages = prev->error_pages;
      }
  
      ngx_conf_merge_str_value(conf->default_type,
                                prev->default_type, "text/plain");
  
      ngx_conf_merge_off_value(conf->client_max_body_size,
                                prev->client_max_body_size, 1 * 1024 * 1024);
      ngx_conf_merge_size_value(conf->client_body_buffer_size,
                                prev->client_body_buffer_size,
                                (size_t) 2 * ngx_pagesize);
      ngx_conf_merge_msec_value(conf->client_body_timeout,
                                prev->client_body_timeout, 60000);
  
      ngx_conf_merge_bitmask_value(conf->keepalive_disable,
                                prev->keepalive_disable,
                                (NGX_CONF_BITMASK_SET
                                 |NGX_HTTP_KEEPALIVE_DISABLE_MSIE6));
      ngx_conf_merge_uint_value(conf->satisfy, prev->satisfy,
                                NGX_HTTP_SATISFY_ALL);
      ngx_conf_merge_uint_value(conf->if_modified_since, prev->if_modified_since,
                                NGX_HTTP_IMS_EXACT);
      ngx_conf_merge_uint_value(conf->max_ranges, prev->max_ranges,
                                NGX_MAX_INT32_VALUE);
      ngx_conf_merge_uint_value(conf->client_body_in_file_only,
                                prev->client_body_in_file_only,
                                NGX_HTTP_REQUEST_BODY_FILE_OFF);
      ngx_conf_merge_value(conf->client_body_in_single_buffer,
                                prev->client_body_in_single_buffer, 0);
      ngx_conf_merge_value(conf->internal, prev->internal, 0);
      ngx_conf_merge_value(conf->sendfile, prev->sendfile, 0);
      ngx_conf_merge_size_value(conf->sendfile_max_chunk,
                                prev->sendfile_max_chunk, 0);
  #if (NGX_HAVE_FILE_AIO)
      ngx_conf_merge_value(conf->aio, prev->aio, NGX_HTTP_AIO_OFF);
  #endif
      ngx_conf_merge_size_value(conf->read_ahead, prev->read_ahead, 0);
      ngx_conf_merge_off_value(conf->directio, prev->directio,
                                NGX_OPEN_FILE_DIRECTIO_OFF);
      ngx_conf_merge_off_value(conf->directio_alignment, prev->directio_alignment,
                                512);
      ngx_conf_merge_value(conf->tcp_nopush, prev->tcp_nopush, 0);
      ngx_conf_merge_value(conf->tcp_nodelay, prev->tcp_nodelay, 1);
  
      ngx_conf_merge_msec_value(conf->send_timeout, prev->send_timeout, 60000);
      ngx_conf_merge_size_value(conf->send_lowat, prev->send_lowat, 0);
      ngx_conf_merge_size_value(conf->postpone_output, prev->postpone_output,
                                1460);
      ngx_conf_merge_size_value(conf->limit_rate, prev->limit_rate, 0);
      ngx_conf_merge_size_value(conf->limit_rate_after, prev->limit_rate_after,
                                0);
      ngx_conf_merge_msec_value(conf->keepalive_timeout,
                                prev->keepalive_timeout, 75000);
      ngx_conf_merge_sec_value(conf->keepalive_header,
                                prev->keepalive_header, 0);
      ngx_conf_merge_uint_value(conf->keepalive_requests,
                                prev->keepalive_requests, 100);
      ngx_conf_merge_uint_value(conf->lingering_close,
                                prev->lingering_close, NGX_HTTP_LINGERING_ON);
      ngx_conf_merge_msec_value(conf->lingering_time,
                                prev->lingering_time, 30000);
      ngx_conf_merge_msec_value(conf->lingering_timeout,
                                prev->lingering_timeout, 5000);
      ngx_conf_merge_msec_value(conf->resolver_timeout,
                                prev->resolver_timeout, 30000);
  
      if (conf->resolver == NULL) {
  
          if (prev->resolver == NULL) {
  
              /*
               * create dummy resolver in http {} context
               * to inherit it in all servers
               */
  
              prev->resolver = ngx_resolver_create(cf, NULL, 0);
              if (prev->resolver == NULL) {
                  return NGX_CONF_ERROR;
              }
          }
  
          conf->resolver = prev->resolver;
      }
  
      if (ngx_conf_merge_path_value(cf, &conf->client_body_temp_path,
                                prev->client_body_temp_path,
                                &ngx_http_client_temp_path)
          != NGX_OK)
      {
          return NGX_CONF_ERROR;
      }
  
      ngx_conf_merge_value(conf->reset_timedout_connection,
                                prev->reset_timedout_connection, 0);
      ngx_conf_merge_value(conf->server_name_in_redirect,
                                prev->server_name_in_redirect, 0);
      ngx_conf_merge_value(conf->port_in_redirect, prev->port_in_redirect, 1);
      ngx_conf_merge_value(conf->msie_padding, prev->msie_padding, 1);
      ngx_conf_merge_value(conf->msie_refresh, prev->msie_refresh, 0);
      ngx_conf_merge_value(conf->log_not_found, prev->log_not_found, 1);
      ngx_conf_merge_value(conf->log_subrequest, prev->log_subrequest, 0);
      ngx_conf_merge_value(conf->recursive_error_pages,
                                prev->recursive_error_pages, 0);
      ngx_conf_merge_value(conf->server_tokens, prev->server_tokens, 1);
      ngx_conf_merge_value(conf->chunked_transfer_encoding,
                                prev->chunked_transfer_encoding, 1);
      ngx_conf_merge_value(conf->etag, prev->etag, 1);
  
      ngx_conf_merge_ptr_value(conf->open_file_cache,
                                prev->open_file_cache, NULL);
  
      ngx_conf_merge_sec_value(conf->open_file_cache_valid,
                                prev->open_file_cache_valid, 60);
  
      ngx_conf_merge_uint_value(conf->open_file_cache_min_uses,
                                prev->open_file_cache_min_uses, 1);
  
      ngx_conf_merge_sec_value(conf->open_file_cache_errors,
                                prev->open_file_cache_errors, 0);
  
      ngx_conf_merge_sec_value(conf->open_file_cache_events,
                                prev->open_file_cache_events, 0);
  #if (NGX_HTTP_GZIP)
  
      ngx_conf_merge_value(conf->gzip_vary, prev->gzip_vary, 0);
      ngx_conf_merge_uint_value(conf->gzip_http_version, prev->gzip_http_version,
                                NGX_HTTP_VERSION_11);
      ngx_conf_merge_bitmask_value(conf->gzip_proxied, prev->gzip_proxied,
                                (NGX_CONF_BITMASK_SET|NGX_HTTP_GZIP_PROXIED_OFF));
  
  #if (NGX_PCRE)
      ngx_conf_merge_ptr_value(conf->gzip_disable, prev->gzip_disable, NULL);
  #endif
  
      if (conf->gzip_disable_msie6 == 3) {
          conf->gzip_disable_msie6 =
              (prev->gzip_disable_msie6 == 3) ? 0 : prev->gzip_disable_msie6;
      }
  
  #if (NGX_HTTP_DEGRADATION)
  
      if (conf->gzip_disable_degradation == 3) {
          conf->gzip_disable_degradation =
              (prev->gzip_disable_degradation == 3) ?
                   0 : prev->gzip_disable_degradation;
      }
  
  #endif
  #endif
  
  #if (NGX_HAVE_OPENAT)
      ngx_conf_merge_uint_value(conf->disable_symlinks, prev->disable_symlinks,
                                NGX_DISABLE_SYMLINKS_OFF);
      ngx_conf_merge_ptr_value(conf->disable_symlinks_from,
                               prev->disable_symlinks_from, NULL);
  #endif
  
      return NGX_CONF_OK;
  }
  
  
  static char *
  ngx_http_core_listen(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_srv_conf_t *cscf = conf;
  
      ngx_str_t              *value, size;
      ngx_url_t               u;
      ngx_uint_t              n;
      ngx_http_listen_opt_t   lsopt;
  
      cscf->listen = 1;
  
      value = cf->args->elts;
  
      ngx_memzero(&u, sizeof(ngx_url_t));
  
      u.url = value[1];
      u.listen = 1;
      u.default_port = 80;
  
      if (ngx_parse_url(cf->pool, &u) != NGX_OK) {
          if (u.err) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "%s in \"%V\" of the \"listen\" directive",
                                 u.err, &u.url);
          }
  
          return NGX_CONF_ERROR;
      }
  
      ngx_memzero(&lsopt, sizeof(ngx_http_listen_opt_t));
  
      ngx_memcpy(&lsopt.u.sockaddr, u.sockaddr, u.socklen);
  
      lsopt.socklen = u.socklen;
      lsopt.backlog = NGX_LISTEN_BACKLOG;
      lsopt.rcvbuf = -1;
      lsopt.sndbuf = -1;
  #if (NGX_HAVE_SETFIB)
      lsopt.setfib = -1;
  #endif
      lsopt.wildcard = u.wildcard;
  
      (void) ngx_sock_ntop(&lsopt.u.sockaddr, lsopt.addr,
                           NGX_SOCKADDR_STRLEN, 1);
  
      for (n = 2; n < cf->args->nelts; n++) {
  
          if (ngx_strcmp(value[n].data, "default_server") == 0
              || ngx_strcmp(value[n].data, "default") == 0)
          {
              lsopt.default_server = 1;
              continue;
          }
  
          if (ngx_strcmp(value[n].data, "bind") == 0) {
              lsopt.set = 1;
              lsopt.bind = 1;
              continue;
          }
  
  #if (NGX_HAVE_SETFIB)
          if (ngx_strncmp(value[n].data, "setfib=", 7) == 0) {
              lsopt.setfib = ngx_atoi(value[n].data + 7, value[n].len - 7);
  
              if (lsopt.setfib == NGX_ERROR) {
                  ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                     "invalid setfib \"%V\"", &value[n]);
                  return NGX_CONF_ERROR;
              }
  
              continue;
          }
  #endif
          if (ngx_strncmp(value[n].data, "backlog=", 8) == 0) {
              lsopt.backlog = ngx_atoi(value[n].data + 8, value[n].len - 8);
              lsopt.set = 1;
              lsopt.bind = 1;
  
              if (lsopt.backlog == NGX_ERROR || lsopt.backlog == 0) {
                  ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                     "invalid backlog \"%V\"", &value[n]);
                  return NGX_CONF_ERROR;
              }
  
              continue;
          }
  
          if (ngx_strncmp(value[n].data, "rcvbuf=", 7) == 0) {
              size.len = value[n].len - 7;
              size.data = value[n].data + 7;
  
              lsopt.rcvbuf = ngx_parse_size(&size);
              lsopt.set = 1;
              lsopt.bind = 1;
  
              if (lsopt.rcvbuf == NGX_ERROR) {
                  ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                     "invalid rcvbuf \"%V\"", &value[n]);
                  return NGX_CONF_ERROR;
              }
  
              continue;
          }
  
          if (ngx_strncmp(value[n].data, "sndbuf=", 7) == 0) {
              size.len = value[n].len - 7;
              size.data = value[n].data + 7;
  
              lsopt.sndbuf = ngx_parse_size(&size);
              lsopt.set = 1;
              lsopt.bind = 1;
  
              if (lsopt.sndbuf == NGX_ERROR) {
                  ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                     "invalid sndbuf \"%V\"", &value[n]);
                  return NGX_CONF_ERROR;
              }
  
              continue;
          }
  
          if (ngx_strncmp(value[n].data, "accept_filter=", 14) == 0) {
  #if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
              lsopt.accept_filter = (char *) &value[n].data[14];
              lsopt.set = 1;
              lsopt.bind = 1;
  #else
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "accept filters \"%V\" are not supported "
                                 "on this platform, ignored",
                                 &value[n]);
  #endif
              continue;
          }
  
          if (ngx_strcmp(value[n].data, "deferred") == 0) {
  #if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
              lsopt.deferred_accept = 1;
              lsopt.set = 1;
              lsopt.bind = 1;
  #else
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "the deferred accept is not supported "
                                 "on this platform, ignored");
  #endif
              continue;
          }
  
          if (ngx_strncmp(value[n].data, "ipv6only=o", 10) == 0) {
  #if (NGX_HAVE_INET6 && defined IPV6_V6ONLY)
              struct sockaddr  *sa;
  
              sa = &lsopt.u.sockaddr;
  
              if (sa->sa_family == AF_INET6) {
  
                  if (ngx_strcmp(&value[n].data[10], "n") == 0) {
                      lsopt.ipv6only = 1;
  
                  } else if (ngx_strcmp(&value[n].data[10], "ff") == 0) {
                      lsopt.ipv6only = 2;
  
                  } else {
                      ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                         "invalid ipv6only flags \"%s\"",
                                         &value[n].data[9]);
                      return NGX_CONF_ERROR;
                  }
  
                  lsopt.set = 1;
                  lsopt.bind = 1;
  
              } else {
                  ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                     "ipv6only is not supported "
                                     "on addr \"%s\", ignored", lsopt.addr);
              }
  
              continue;
  #else
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "ipv6only is not supported "
                                 "on this platform");
              return NGX_CONF_ERROR;
  #endif
          }
  
          if (ngx_strcmp(value[n].data, "ssl") == 0) {
  #if (NGX_HTTP_SSL)
              lsopt.ssl = 1;
              continue;
  #else
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "the \"ssl\" parameter requires "
                                 "ngx_http_ssl_module");
              return NGX_CONF_ERROR;
  #endif
          }
  
          if (ngx_strncmp(value[n].data, "so_keepalive=", 13) == 0) {
  
              if (ngx_strcmp(&value[n].data[13], "on") == 0) {
                  lsopt.so_keepalive = 1;
  
              } else if (ngx_strcmp(&value[n].data[13], "off") == 0) {
                  lsopt.so_keepalive = 2;
  
              } else {
  
  #if (NGX_HAVE_KEEPALIVE_TUNABLE)
                  u_char     *p, *end;
                  ngx_str_t   s;
  
                  end = value[n].data + value[n].len;
                  s.data = value[n].data + 13;
  
                  p = ngx_strlchr(s.data, end, ':');
                  if (p == NULL) {
                      p = end;
                  }
  
                  if (p > s.data) {
                      s.len = p - s.data;
  
                      lsopt.tcp_keepidle = ngx_parse_time(&s, 1);
                      if (lsopt.tcp_keepidle == (time_t) NGX_ERROR) {
                          goto invalid_so_keepalive;
                      }
                  }
  
                  s.data = (p < end) ? (p + 1) : end;
  
                  p = ngx_strlchr(s.data, end, ':');
                  if (p == NULL) {
                      p = end;
                  }
  
                  if (p > s.data) {
                      s.len = p - s.data;
  
                      lsopt.tcp_keepintvl = ngx_parse_time(&s, 1);
                      if (lsopt.tcp_keepintvl == (time_t) NGX_ERROR) {
                          goto invalid_so_keepalive;
                      }
                  }
  
                  s.data = (p < end) ? (p + 1) : end;
  
                  if (s.data < end) {
                      s.len = end - s.data;
  
                      lsopt.tcp_keepcnt = ngx_atoi(s.data, s.len);
                      if (lsopt.tcp_keepcnt == NGX_ERROR) {
                          goto invalid_so_keepalive;
                      }
                  }
  
                  if (lsopt.tcp_keepidle == 0 && lsopt.tcp_keepintvl == 0
                      && lsopt.tcp_keepcnt == 0)
                  {
                      goto invalid_so_keepalive;
                  }
  
                  lsopt.so_keepalive = 1;
  
  #else
  
                  ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                     "the \"so_keepalive\" parameter accepts "
                                     "only \"on\" or \"off\" on this platform");
                  return NGX_CONF_ERROR;
  
  #endif
              }
  
              lsopt.set = 1;
              lsopt.bind = 1;
  
              continue;
  
  #if (NGX_HAVE_KEEPALIVE_TUNABLE)
          invalid_so_keepalive:
  
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "invalid so_keepalive value: \"%s\"",
                                 &value[n].data[13]);
              return NGX_CONF_ERROR;
  #endif
          }
  
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "invalid parameter \"%V\"", &value[n]);
          return NGX_CONF_ERROR;
      }
  
      if (ngx_http_add_listen(cf, cscf, &lsopt) == NGX_OK) {
          return NGX_CONF_OK;
      }
  
      return NGX_CONF_ERROR;
  }
  
  
  static char *
  ngx_http_core_server_name(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_srv_conf_t *cscf = conf;
  
      u_char                   ch;
      ngx_str_t               *value;
      ngx_uint_t               i;
      ngx_http_server_name_t  *sn;
  
      value = cf->args->elts;
  
      for (i = 1; i < cf->args->nelts; i++) {
  
          ch = value[i].data[0];
  
          if ((ch == '*' && (value[i].len < 3 || value[i].data[1] != '.'))
              || (ch == '.' && value[i].len < 2))
          {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "server name \"%V\" is invalid", &value[i]);
              return NGX_CONF_ERROR;
          }
  
          if (ngx_strchr(value[i].data, '/')) {
              ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
                                 "server name \"%V\" has suspicious symbols",
                                 &value[i]);
          }
  
          sn = ngx_array_push(&cscf->server_names);
          if (sn == NULL) {
              return NGX_CONF_ERROR;
          }
  
  #if (NGX_PCRE)
          sn->regex = NULL;
  #endif
          sn->server = cscf;
  
          if (ngx_strcasecmp(value[i].data, (u_char *) "$hostname") == 0) {
              sn->name = cf->cycle->hostname;
  
          } else {
              sn->name = value[i];
          }
  
          if (value[i].data[0] != '~') {
              ngx_strlow(sn->name.data, sn->name.data, sn->name.len);
              continue;
          }
  
  #if (NGX_PCRE)
          {
          u_char               *p;
          ngx_regex_compile_t   rc;
          u_char                errstr[NGX_MAX_CONF_ERRSTR];
  
          if (value[i].len == 1) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "empty regex in server name \"%V\"", &value[i]);
              return NGX_CONF_ERROR;
          }
  
          value[i].len--;
          value[i].data++;
  
          ngx_memzero(&rc, sizeof(ngx_regex_compile_t));
  
          rc.pattern = value[i];
          rc.err.len = NGX_MAX_CONF_ERRSTR;
          rc.err.data = errstr;
  
          for (p = value[i].data; p < value[i].data + value[i].len; p++) {
              if (*p >= 'A' && *p <= 'Z') {
                  rc.options = NGX_REGEX_CASELESS;
                  break;
              }
          }
  
          sn->regex = ngx_http_regex_compile(cf, &rc);
          if (sn->regex == NULL) {
              return NGX_CONF_ERROR;
          }
  
          sn->name = value[i];
          cscf->captures = (rc.captures > 0);
          }
  #else
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "using regex \"%V\" "
                             "requires PCRE library", &value[i]);
  
          return NGX_CONF_ERROR;
  #endif
      }
  
      return NGX_CONF_OK;
  }
  
  
  static char *
  ngx_http_core_root(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_loc_conf_t *clcf = conf;
  
      ngx_str_t                  *value;
      ngx_int_t                   alias;
      ngx_uint_t                  n;
      ngx_http_script_compile_t   sc;
  
      alias = (cmd->name.len == sizeof("alias") - 1) ? 1 : 0;
  
      if (clcf->root.data) {
  
          if ((clcf->alias != 0) == alias) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "\"%V\" directive is duplicate",
                                 &cmd->name);
          } else {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "\"%V\" directive is duplicate, "
                                 "\"%s\" directive was specified earlier",
                                 &cmd->name, clcf->alias ? "alias" : "root");
          }
  
          return NGX_CONF_ERROR;
      }
  
      if (clcf->named && alias) {
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "the \"alias\" directive cannot be used "
                             "inside the named location");
  
          return NGX_CONF_ERROR;
      }
  
      value = cf->args->elts;
  
      if (ngx_strstr(value[1].data, "$document_root")
          || ngx_strstr(value[1].data, "${document_root}"))
      {
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "the $document_root variable cannot be used "
                             "in the \"%V\" directive",
                             &cmd->name);
  
          return NGX_CONF_ERROR;
      }
  
      if (ngx_strstr(value[1].data, "$realpath_root")
          || ngx_strstr(value[1].data, "${realpath_root}"))
      {
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "the $realpath_root variable cannot be used "
                             "in the \"%V\" directive",
                             &cmd->name);
  
          return NGX_CONF_ERROR;
      }
  
      clcf->alias = alias ? clcf->name.len : 0;
      clcf->root = value[1];
  
      if (!alias && clcf->root.data[clcf->root.len - 1] == '/') {
          clcf->root.len--;
      }
  
      if (clcf->root.data[0] != '$') {
          if (ngx_conf_full_name(cf->cycle, &clcf->root, 0) != NGX_OK) {
              return NGX_CONF_ERROR;
          }
      }
  
      n = ngx_http_script_variables_count(&clcf->root);
  
      ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
      sc.variables = n;
  
  #if (NGX_PCRE)
      if (alias && clcf->regex) {
          n = 1;
      }
  #endif
  
      if (n) {
          sc.cf = cf;
          sc.source = &clcf->root;
          sc.lengths = &clcf->root_lengths;
          sc.values = &clcf->root_values;
          sc.complete_lengths = 1;
          sc.complete_values = 1;
  
          if (ngx_http_script_compile(&sc) != NGX_OK) {
              return NGX_CONF_ERROR;
          }
      }
  
      return NGX_CONF_OK;
  }
  
  
  static ngx_http_method_name_t  ngx_methods_names[] = {
     { (u_char *) "GET",       (uint32_t) ~NGX_HTTP_GET },
     { (u_char *) "HEAD",      (uint32_t) ~NGX_HTTP_HEAD },
     { (u_char *) "POST",      (uint32_t) ~NGX_HTTP_POST },
     { (u_char *) "PUT",       (uint32_t) ~NGX_HTTP_PUT },
     { (u_char *) "DELETE",    (uint32_t) ~NGX_HTTP_DELETE },
     { (u_char *) "MKCOL",     (uint32_t) ~NGX_HTTP_MKCOL },
     { (u_char *) "COPY",      (uint32_t) ~NGX_HTTP_COPY },
     { (u_char *) "MOVE",      (uint32_t) ~NGX_HTTP_MOVE },
     { (u_char *) "OPTIONS",   (uint32_t) ~NGX_HTTP_OPTIONS },
     { (u_char *) "PROPFIND" , (uint32_t) ~NGX_HTTP_PROPFIND },
     { (u_char *) "PROPPATCH", (uint32_t) ~NGX_HTTP_PROPPATCH },
     { (u_char *) "LOCK",      (uint32_t) ~NGX_HTTP_LOCK },
     { (u_char *) "UNLOCK",    (uint32_t) ~NGX_HTTP_UNLOCK },
     { (u_char *) "PATCH",     (uint32_t) ~NGX_HTTP_PATCH },
     { NULL, 0 }
  };
  
  
  static char *
  ngx_http_core_limit_except(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_loc_conf_t *pclcf = conf;
  
      char                      *rv;
      void                      *mconf;
      ngx_str_t                 *value;
      ngx_uint_t                 i;
      ngx_conf_t                 save;
      ngx_http_module_t         *module;
      ngx_http_conf_ctx_t       *ctx, *pctx;
      ngx_http_method_name_t    *name;
      ngx_http_core_loc_conf_t  *clcf;
  
      if (pclcf->limit_except) {
          return "duplicate";
      }
  
      pclcf->limit_except = 0xffffffff;
  
      value = cf->args->elts;
  
      for (i = 1; i < cf->args->nelts; i++) {
          for (name = ngx_methods_names; name->name; name++) {
  
              if (ngx_strcasecmp(value[i].data, name->name) == 0) {
                  pclcf->limit_except &= name->method;
                  goto next;
              }
          }
  
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "invalid method \"%V\"", &value[i]);
          return NGX_CONF_ERROR;
  
      next:
          continue;
      }
  
      if (!(pclcf->limit_except & NGX_HTTP_GET)) {
          pclcf->limit_except &= (uint32_t) ~NGX_HTTP_HEAD;
      }
  
      ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t));
      if (ctx == NULL) {
          return NGX_CONF_ERROR;
      }
  
      pctx = cf->ctx;
      ctx->main_conf = pctx->main_conf;
      ctx->srv_conf = pctx->srv_conf;
  
      ctx->loc_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module);
      if (ctx->loc_conf == NULL) {
          return NGX_CONF_ERROR;
      }
  
      for (i = 0; ngx_modules[i]; i++) {
          if (ngx_modules[i]->type != NGX_HTTP_MODULE) {
              continue;
          }
  
          module = ngx_modules[i]->ctx;
  
          if (module->create_loc_conf) {
  
              mconf = module->create_loc_conf(cf);
              if (mconf == NULL) {
                   return NGX_CONF_ERROR;
              }
  
              ctx->loc_conf[ngx_modules[i]->ctx_index] = mconf;
          }
      }
  
  
      clcf = ctx->loc_conf[ngx_http_core_module.ctx_index];
      pclcf->limit_except_loc_conf = ctx->loc_conf;
      clcf->loc_conf = ctx->loc_conf;
      clcf->name = pclcf->name;
      clcf->noname = 1;
      clcf->lmt_excpt = 1;
  
      if (ngx_http_add_location(cf, &pclcf->locations, clcf) != NGX_OK) {
          return NGX_CONF_ERROR;
      }
  
      save = *cf;
      cf->ctx = ctx;
      cf->cmd_type = NGX_HTTP_LMT_CONF;
  
      rv = ngx_conf_parse(cf, NULL);
  
      *cf = save;
  
      return rv;
  }
  
  
  static char *
  ngx_http_core_directio(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_loc_conf_t *clcf = conf;
  
      ngx_str_t  *value;
  
      if (clcf->directio != NGX_CONF_UNSET) {
          return "is duplicate";
      }
  
      value = cf->args->elts;
  
      if (ngx_strcmp(value[1].data, "off") == 0) {
          clcf->directio = NGX_OPEN_FILE_DIRECTIO_OFF;
          return NGX_CONF_OK;
      }
  
      clcf->directio = ngx_parse_offset(&value[1]);
      if (clcf->directio == (off_t) NGX_ERROR) {
          return "invalid value";
      }
  
      return NGX_CONF_OK;
  }
  
  
  static char *
  ngx_http_core_error_page(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_loc_conf_t *clcf = conf;
  
      u_char                            *p;
      ngx_int_t                          overwrite;
      ngx_str_t                         *value, uri, args;
      ngx_uint_t                         i, n;
      ngx_http_err_page_t               *err;
      ngx_http_complex_value_t           cv;
      ngx_http_compile_complex_value_t   ccv;
  
      if (clcf->error_pages == NULL) {
          clcf->error_pages = ngx_array_create(cf->pool, 4,
                                               sizeof(ngx_http_err_page_t));
          if (clcf->error_pages == NULL) {
              return NGX_CONF_ERROR;
          }
      }
  
      value = cf->args->elts;
  
      i = cf->args->nelts - 2;
  
      if (value[i].data[0] == '=') {
          if (i == 1) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "invalid value \"%V\"", &value[i]);
              return NGX_CONF_ERROR;
          }
  
          if (value[i].len > 1) {
              overwrite = ngx_atoi(&value[i].data[1], value[i].len - 1);
  
              if (overwrite == NGX_ERROR) {
                  ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                     "invalid value \"%V\"", &value[i]);
                  return NGX_CONF_ERROR;
              }
  
          } else {
              overwrite = 0;
          }
  
          n = 2;
  
      } else {
          overwrite = -1;
          n = 1;
      }
  
      uri = value[cf->args->nelts - 1];
  
      ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
  
      ccv.cf = cf;
      ccv.value = &uri;
      ccv.complex_value = &cv;
  
      if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
          return NGX_CONF_ERROR;
      }
  
      ngx_str_null(&args);
  
      if (cv.lengths == NULL && uri.data[0] == '/') {
          p = (u_char *) ngx_strchr(uri.data, '?');
  
          if (p) {
              cv.value.len = p - uri.data;
              cv.value.data = uri.data;
              p++;
              args.len = (uri.data + uri.len) - p;
              args.data = p;
          }
      }
  
      for (i = 1; i < cf->args->nelts - n; i++) {
          err = ngx_array_push(clcf->error_pages);
          if (err == NULL) {
              return NGX_CONF_ERROR;
          }
  
          err->status = ngx_atoi(value[i].data, value[i].len);
  
          if (err->status == NGX_ERROR || err->status == 499) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "invalid value \"%V\"", &value[i]);
              return NGX_CONF_ERROR;
          }
  
          if (err->status < 300 || err->status > 599) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "value \"%V\" must be between 300 and 599",
                                 &value[i]);
              return NGX_CONF_ERROR;
          }
  
          err->overwrite = overwrite;
  
          if (overwrite == -1) {
              switch (err->status) {
                  case NGX_HTTP_TO_HTTPS:
                  case NGX_HTTPS_CERT_ERROR:
                  case NGX_HTTPS_NO_CERT:
                      err->overwrite = NGX_HTTP_BAD_REQUEST;
                  default:
                      break;
              }
          }
  
          err->value = cv;
          err->args = args;
      }
  
      return NGX_CONF_OK;
  }
  
  
  static char *
  ngx_http_core_try_files(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_loc_conf_t *clcf = conf;
  
      ngx_str_t                  *value;
      ngx_int_t                   code;
      ngx_uint_t                  i, n;
      ngx_http_try_file_t        *tf;
      ngx_http_script_compile_t   sc;
      ngx_http_core_main_conf_t  *cmcf;
  
      if (clcf->try_files) {
          return "is duplicate";
      }
  
      cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
  
      cmcf->try_files = 1;
  
      tf = ngx_pcalloc(cf->pool, cf->args->nelts * sizeof(ngx_http_try_file_t));
      if (tf == NULL) {
          return NGX_CONF_ERROR;
      }
  
      clcf->try_files = tf;
  
      value = cf->args->elts;
  
      for (i = 0; i < cf->args->nelts - 1; i++) {
  
          tf[i].name = value[i + 1];
  
          if (tf[i].name.data[tf[i].name.len - 1] == '/') {
              tf[i].test_dir = 1;
              tf[i].name.len--;
              tf[i].name.data[tf[i].name.len] = '\0';
          }
  
          n = ngx_http_script_variables_count(&tf[i].name);
  
          if (n) {
              ngx_memzero(&sc, sizeof(ngx_http_script_compile_t));
  
              sc.cf = cf;
              sc.source = &tf[i].name;
              sc.lengths = &tf[i].lengths;
              sc.values = &tf[i].values;
              sc.variables = n;
              sc.complete_lengths = 1;
              sc.complete_values = 1;
  
              if (ngx_http_script_compile(&sc) != NGX_OK) {
                  return NGX_CONF_ERROR;
              }
  
          } else {
              /* add trailing '\0' to length */
              tf[i].name.len++;
          }
      }
  
      if (tf[i - 1].name.data[0] == '=') {
  
          code = ngx_atoi(tf[i - 1].name.data + 1, tf[i - 1].name.len - 2);
  
          if (code == NGX_ERROR || code > 999) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                 "invalid code \"%*s\"",
                                 tf[i - 1].name.len - 1, tf[i - 1].name.data);
              return NGX_CONF_ERROR;
          }
  
          tf[i].code = code;
      }
  
      return NGX_CONF_OK;
  }
  
  
  static char *
  ngx_http_core_open_file_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_loc_conf_t *clcf = conf;
  
      time_t       inactive;
      ngx_str_t   *value, s;
      ngx_int_t    max;
      ngx_uint_t   i;
  
      if (clcf->open_file_cache != NGX_CONF_UNSET_PTR) {
          return "is duplicate";
      }
  
      value = cf->args->elts;
  
      max = 0;
      inactive = 60;
  
      for (i = 1; i < cf->args->nelts; i++) {
  
          if (ngx_strncmp(value[i].data, "max=", 4) == 0) {
  
              max = ngx_atoi(value[i].data + 4, value[i].len - 4);
              if (max <= 0) {
                  goto failed;
              }
  
              continue;
          }
  
          if (ngx_strncmp(value[i].data, "inactive=", 9) == 0) {
  
              s.len = value[i].len - 9;
              s.data = value[i].data + 9;
  
              inactive = ngx_parse_time(&s, 1);
              if (inactive == (time_t) NGX_ERROR) {
                  goto failed;
              }
  
              continue;
          }
  
          if (ngx_strcmp(value[i].data, "off") == 0) {
  
              clcf->open_file_cache = NULL;
  
              continue;
          }
  
      failed:
  
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "invalid \"open_file_cache\" parameter \"%V\"",
                             &value[i]);
          return NGX_CONF_ERROR;
      }
  
      if (clcf->open_file_cache == NULL) {
          return NGX_CONF_OK;
      }
  
      if (max == 0) {
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                          "\"open_file_cache\" must have the \"max\" parameter");
          return NGX_CONF_ERROR;
      }
  
      clcf->open_file_cache = ngx_open_file_cache_init(cf->pool, max, inactive);
      if (clcf->open_file_cache) {
          return NGX_CONF_OK;
      }
  
      return NGX_CONF_ERROR;
  }
  
  
  static char *
  ngx_http_core_error_log(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_loc_conf_t *clcf = conf;
  
      ngx_str_t  *value, name;
  
      if (clcf->error_log) {
          return "is duplicate";
      }
  
      value = cf->args->elts;
  
      if (ngx_strcmp(value[1].data, "stderr") == 0) {
          ngx_str_null(&name);
  
      } else {
          name = value[1];
      }
  
      clcf->error_log = ngx_log_create(cf->cycle, &name);
      if (clcf->error_log == NULL) {
          return NGX_CONF_ERROR;
      }
  
      if (cf->args->nelts == 2) {
          clcf->error_log->log_level = NGX_LOG_ERR;
          return NGX_CONF_OK;
      }
  
      return ngx_log_set_levels(cf, clcf->error_log);
  }
  
  
  static char *
  ngx_http_core_keepalive(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_loc_conf_t *clcf = conf;
  
      ngx_str_t  *value;
  
      if (clcf->keepalive_timeout != NGX_CONF_UNSET_MSEC) {
          return "is duplicate";
      }
  
      value = cf->args->elts;
  
      clcf->keepalive_timeout = ngx_parse_time(&value[1], 0);
  
      if (clcf->keepalive_timeout == (ngx_msec_t) NGX_ERROR) {
          return "invalid value";
      }
  
      if (cf->args->nelts == 2) {
          return NGX_CONF_OK;
      }
  
      clcf->keepalive_header = ngx_parse_time(&value[2], 1);
  
      if (clcf->keepalive_header == (time_t) NGX_ERROR) {
          return "invalid value";
      }
  
      return NGX_CONF_OK;
  }
  
  
  static char *
  ngx_http_core_internal(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_loc_conf_t *clcf = conf;
  
      if (clcf->internal != NGX_CONF_UNSET) {
          return "is duplicate";
      }
  
      clcf->internal = 1;
  
      return NGX_CONF_OK;
  }
  
  
  static char *
  ngx_http_core_resolver(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_loc_conf_t  *clcf = conf;
  
      ngx_str_t  *value;
  
      if (clcf->resolver) {
          return "is duplicate";
      }
  
      value = cf->args->elts;
  
      clcf->resolver = ngx_resolver_create(cf, &value[1], cf->args->nelts - 1);
      if (clcf->resolver == NULL) {
          return NGX_CONF_ERROR;
      }
  
      return NGX_CONF_OK;
  }
  
  
  #if (NGX_HTTP_GZIP)
  
  static char *
  ngx_http_gzip_disable(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_loc_conf_t  *clcf = conf;
  
  #if (NGX_PCRE)
  
      ngx_str_t            *value;
      ngx_uint_t            i;
      ngx_regex_elt_t      *re;
      ngx_regex_compile_t   rc;
      u_char                errstr[NGX_MAX_CONF_ERRSTR];
  
      if (clcf->gzip_disable == NGX_CONF_UNSET_PTR) {
          clcf->gzip_disable = ngx_array_create(cf->pool, 2,
                                                sizeof(ngx_regex_elt_t));
          if (clcf->gzip_disable == NULL) {
              return NGX_CONF_ERROR;
          }
      }
  
      value = cf->args->elts;
  
      ngx_memzero(&rc, sizeof(ngx_regex_compile_t));
  
      rc.pool = cf->pool;
      rc.err.len = NGX_MAX_CONF_ERRSTR;
      rc.err.data = errstr;
  
      for (i = 1; i < cf->args->nelts; i++) {
  
          if (ngx_strcmp(value[i].data, "msie6") == 0) {
              clcf->gzip_disable_msie6 = 1;
              continue;
          }
  
  #if (NGX_HTTP_DEGRADATION)
  
          if (ngx_strcmp(value[i].data, "degradation") == 0) {
              clcf->gzip_disable_degradation = 1;
              continue;
          }
  
  #endif
  
          re = ngx_array_push(clcf->gzip_disable);
          if (re == NULL) {
              return NGX_CONF_ERROR;
          }
  
          rc.pattern = value[i];
          rc.options = NGX_REGEX_CASELESS;
  
          if (ngx_regex_compile(&rc) != NGX_OK) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V", &rc.err);
              return NGX_CONF_ERROR;
          }
  
          re->regex = rc.regex;
          re->name = value[i].data;
      }
  
      return NGX_CONF_OK;
  
  #else
      ngx_str_t   *value;
      ngx_uint_t   i;
  
      value = cf->args->elts;
  
      for (i = 1; i < cf->args->nelts; i++) {
          if (ngx_strcmp(value[i].data, "msie6") == 0) {
              clcf->gzip_disable_msie6 = 1;
              continue;
          }
  
  #if (NGX_HTTP_DEGRADATION)
  
          if (ngx_strcmp(value[i].data, "degradation") == 0) {
              clcf->gzip_disable_degradation = 1;
              continue;
          }
  
  #endif
  
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "without PCRE library \"gzip_disable\" supports "
                             "builtin \"msie6\" and \"degradation\" mask only");
  
          return NGX_CONF_ERROR;
      }
  
      return NGX_CONF_OK;
  
  #endif
  }
  
  #endif
  
  
  #if (NGX_HAVE_OPENAT)
  
  static char *
  ngx_http_disable_symlinks(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
  {
      ngx_http_core_loc_conf_t *clcf = conf;
  
      ngx_str_t                         *value;
      ngx_uint_t                         i;
      ngx_http_compile_complex_value_t   ccv;
  
      if (clcf->disable_symlinks != NGX_CONF_UNSET_UINT) {
          return "is duplicate";
      }
  
      value = cf->args->elts;
  
      for (i = 1; i < cf->args->nelts; i++) {
  
          if (ngx_strcmp(value[i].data, "off") == 0) {
              clcf->disable_symlinks = NGX_DISABLE_SYMLINKS_OFF;
              continue;
          }
  
          if (ngx_strcmp(value[i].data, "if_not_owner") == 0) {
              clcf->disable_symlinks = NGX_DISABLE_SYMLINKS_NOTOWNER;
              continue;
          }
  
          if (ngx_strcmp(value[i].data, "on") == 0) {
              clcf->disable_symlinks = NGX_DISABLE_SYMLINKS_ON;
              continue;
          }
  
          if (ngx_strncmp(value[i].data, "from=", 5) == 0) {
              value[i].len -= 5;
              value[i].data += 5;
  
              ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
  
              ccv.cf = cf;
              ccv.value = &value[i];
              ccv.complex_value = ngx_palloc(cf->pool,
                                             sizeof(ngx_http_complex_value_t));
              if (ccv.complex_value == NULL) {
                  return NGX_CONF_ERROR;
              }
  
              if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
                  return NGX_CONF_ERROR;
              }
  
              clcf->disable_symlinks_from = ccv.complex_value;
  
              continue;
          }
  
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "invalid parameter \"%V\"", &value[i]);
          return NGX_CONF_ERROR;
      }
  
      if (clcf->disable_symlinks == NGX_CONF_UNSET_UINT) {
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "\"%V\" must have \"off\", \"on\" "
                             "or \"if_not_owner\" parameter",
                             &cmd->name);
          return NGX_CONF_ERROR;
      }
  
      if (cf->args->nelts == 2) {
          clcf->disable_symlinks_from = NULL;
          return NGX_CONF_OK;
      }
  
      if (clcf->disable_symlinks_from == NGX_CONF_UNSET_PTR) {
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "duplicate parameters \"%V %V\"",
                             &value[1], &value[2]);
          return NGX_CONF_ERROR;
      }
  
      if (clcf->disable_symlinks == NGX_DISABLE_SYMLINKS_OFF) {
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "\"from=\" cannot be used with \"off\" parameter");
          return NGX_CONF_ERROR;
      }
  
      return NGX_CONF_OK;
  }
  
  #endif
  
  
  static char *
  ngx_http_core_lowat_check(ngx_conf_t *cf, void *post, void *data)
  {
  #if (NGX_FREEBSD)
      ssize_t *np = data;
  
      if ((u_long) *np >= ngx_freebsd_net_inet_tcp_sendspace) {
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "\"send_lowat\" must be less than %d "
                             "(sysctl net.inet.tcp.sendspace)",
                             ngx_freebsd_net_inet_tcp_sendspace);
  
          return NGX_CONF_ERROR;
      }
  
  #elif !(NGX_HAVE_SO_SNDLOWAT)
      ssize_t *np = data;
  
      ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
                         "\"send_lowat\" is not supported, ignored");
  
      *np = 0;
  
  #endif
  
      return NGX_CONF_OK;
  }
  
  
  static char *
  ngx_http_core_pool_size(ngx_conf_t *cf, void *post, void *data)
  {
      size_t *sp = data;
  
      if (*sp < NGX_MIN_POOL_SIZE) {
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "the pool size must be no less than %uz",
                             NGX_MIN_POOL_SIZE);
          return NGX_CONF_ERROR;
      }
  
      if (*sp % NGX_POOL_ALIGNMENT) {
          ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                             "the pool size must be a multiple of %uz",
                             NGX_POOL_ALIGNMENT);
          return NGX_CONF_ERROR;
      }
  
      return NGX_CONF_OK;
  }
  