text: /* Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #define CORE_PRIVATE
  
  #include "mod_proxy.h"
  #include "mod_core.h"
  #include "apr_optional.h"
  #include "scoreboard.h"
  #include "mod_status.h"
  
  #if (MODULE_MAGIC_NUMBER_MAJOR > 20020903)
  #include "mod_ssl.h"
  #else
  APR_DECLARE_OPTIONAL_FN(int, ssl_proxy_enable, (conn_rec *));
  APR_DECLARE_OPTIONAL_FN(int, ssl_engine_disable, (conn_rec *));
  APR_DECLARE_OPTIONAL_FN(int, ssl_is_https, (conn_rec *));
  APR_DECLARE_OPTIONAL_FN(char *, ssl_var_lookup,
                          (apr_pool_t *, server_rec *,
                           conn_rec *, request_rec *, char *));
  #endif
  
  #ifndef MAX
  #define MAX(x,y) ((x) >= (y) ? (x) : (y))
  #endif
  
  /*
   * A Web proxy module. Stages:
   *
   *  translate_name: set filename to proxy:<URL>
   *  map_to_storage: run proxy_walk (rather than directory_walk/file_walk)
   *                  can't trust directory_walk/file_walk since these are
   *                  not in our filesystem.  Prevents mod_http from serving
   *                  the TRACE request we will set aside to handle later.
   *  type_checker:   set type to PROXY_MAGIC_TYPE if filename begins proxy:
   *  fix_ups:        convert the URL stored in the filename to the
   *                  canonical form.
   *  handler:        handle proxy requests
   */
  
  /* -------------------------------------------------------------- */
  /* Translate the URL into a 'filename' */
  
  #define PROXY_COPY_CONF_PARAMS(w, c) \
      do {                             \
          (w)->timeout              = (c)->timeout;               \
          (w)->timeout_set          = (c)->timeout_set;           \
          (w)->recv_buffer_size     = (c)->recv_buffer_size;      \
          (w)->recv_buffer_size_set = (c)->recv_buffer_size_set;  \
          (w)->io_buffer_size       = (c)->io_buffer_size;        \
          (w)->io_buffer_size_set   = (c)->io_buffer_size_set;    \
      } while (0)
  
  
  #define APACHE2NGINX
  
  
  static const char *set_worker_param(apr_pool_t *p,
                                      proxy_worker *worker,
                                      const char *key,
                                      const char *val)
  {
  
      int ival;
      apr_interval_time_t timeout;
  
      if (!strcasecmp(key, "loadfactor")) {
          /* Normalized load factor. Used with BalancerMamber,
           * it is a number between 1 and 100.
           */
          worker->lbfactor = atoi(val);
          if (worker->lbfactor < 1 || worker->lbfactor > 100)
              return "LoadFactor must be number between 1..100";
      }
      else if (!strcasecmp(key, "retry")) {
          /* If set it will give the retry timeout for the worker
           * The default value is 60 seconds, meaning that if
           * in error state, it will be retried after that timeout.
           */
          ival = atoi(val);
          if (ival < 0)
              return "Retry must be a positive value";
          worker->retry = apr_time_from_sec(ival);
          worker->retry_set = 1;
      }
      else if (!strcasecmp(key, "ttl")) {
          /* Time in seconds that will destroy all the connections
           * that exceed the smax
           */
          ival = atoi(val);
          if (ival < 1)
              return "TTL must be at least one second";
          worker->ttl = apr_time_from_sec(ival);
      }
      else if (!strcasecmp(key, "min")) {
          /* Initial number of connections to remote
           */
          ival = atoi(val);
          if (ival < 0)
              return "Min must be a positive number";
          worker->min = ival;
      }
      else if (!strcasecmp(key, "max")) {
          /* Maximum number of connections to remote
           */
          ival = atoi(val);
          if (ival < 0)
              return "Max must be a positive number";
          worker->hmax = ival;
      }
      /* XXX: More inteligent naming needed */
      else if (!strcasecmp(key, "smax")) {
          /* Maximum number of connections to remote that
           * will not be destroyed
           */
          ival = atoi(val);
          if (ival < 0)
              return "Smax must be a positive number";
          worker->smax = ival;
      }
      else if (!strcasecmp(key, "acquire")) {
          /* Acquire in given unit (default is milliseconds).
           * If set this will be the maximum time to
           * wait for a free connection.
           */
          if (ap_timeout_parameter_parse(val, &timeout, "ms") != APR_SUCCESS)
              return "Acquire timeout has wrong format";
          if (timeout < 1000)
              return "Acquire must be at least one millisecond";
          worker->acquire = timeout;
          worker->acquire_set = 1;
      }
      else if (!strcasecmp(key, "timeout")) {
          /* Connection timeout in seconds.
           * Defaults to server timeout.
           */
          ival = atoi(val);
          if (ival < 1)
              return "Timeout must be at least one second";
          worker->timeout = apr_time_from_sec(ival);
          worker->timeout_set = 1;
      }
      else if (!strcasecmp(key, "iobuffersize")) {
          long s = atol(val);
          worker->io_buffer_size = ((s > AP_IOBUFSIZE) ? s : AP_IOBUFSIZE);
          worker->io_buffer_size_set = 1;
      }
      else if (!strcasecmp(key, "receivebuffersize")) {
          ival = atoi(val);
          if (ival < 512 && ival != 0) {
              return "ReceiveBufferSize must be >= 512 bytes, or 0 for system default.";
          }
          worker->recv_buffer_size = ival;
          worker->recv_buffer_size_set = 1;
      }
      else if (!strcasecmp(key, "keepalive")) {
          if (!strcasecmp(val, "on"))
              worker->keepalive = 1;
          else if (!strcasecmp(val, "off"))
              worker->keepalive = 0;
          else
              return "KeepAlive must be On|Off";
          worker->keepalive_set = 1;
      }
      else if (!strcasecmp(key, "disablereuse")) {
          if (!strcasecmp(val, "on"))
              worker->disablereuse = 1;
          else if (!strcasecmp(val, "off"))
              worker->disablereuse = 0;
          else
              return "DisableReuse must be On|Off";
          worker->disablereuse_set = 1;
      }
      else if (!strcasecmp(key, "route")) {
          /* Worker route.
           */
          if (strlen(val) > PROXY_WORKER_MAX_ROUTE_SIZ)
              return "Route length must be < 64 characters";
          worker->route = apr_pstrdup(p, val);
      }
      else if (!strcasecmp(key, "redirect")) {
          /* Worker redirection route.
           */
          if (strlen(val) > PROXY_WORKER_MAX_ROUTE_SIZ)
              return "Redirect length must be < 64 characters";
          worker->redirect = apr_pstrdup(p, val);
      }
      else if (!strcasecmp(key, "status")) {
          const char *v;
          int mode = 1;
          /* Worker status.
           */
          for (v = val; *v; v++) {
              if (*v == '+') {
                  mode = 1;
                  v++;
              }
              else if (*v == '-') {
                  mode = 0;
                  v++;
              }
              if (*v == 'D' || *v == 'd') {
                  if (mode)
                      worker->status |= PROXY_WORKER_DISABLED;
                  else
                      worker->status &= ~PROXY_WORKER_DISABLED;
              }
              else if (*v == 'S' || *v == 's') {
                  if (mode)
                      worker->status |= PROXY_WORKER_STOPPED;
                  else
                      worker->status &= ~PROXY_WORKER_STOPPED;
              }
              else if (*v == 'E' || *v == 'e') {
                  if (mode)
                      worker->status |= PROXY_WORKER_IN_ERROR;
                  else
                      worker->status &= ~PROXY_WORKER_IN_ERROR;
              }
              else if (*v == 'H' || *v == 'h') {
                  if (mode)
                      worker->status |= PROXY_WORKER_HOT_STANDBY;
                  else
                      worker->status &= ~PROXY_WORKER_HOT_STANDBY;
              }
              else if (*v == 'I' || *v == 'i') {
                  if (mode)
                      worker->status |= PROXY_WORKER_IGNORE_ERRORS;
                  else
                      worker->status &= ~PROXY_WORKER_IGNORE_ERRORS;
              }
              else {
                  return "Unknown status parameter option";
              }
          }
      }
      else if (!strcasecmp(key, "flushpackets")) {
          if (!strcasecmp(val, "on"))
              worker->flush_packets = flush_on;
          else if (!strcasecmp(val, "off"))
              worker->flush_packets = flush_off;
          else if (!strcasecmp(val, "auto"))
              worker->flush_packets = flush_auto;
          else
              return "flushpackets must be on|off|auto";
      }
      else if (!strcasecmp(key, "flushwait")) {
          ival = atoi(val);
          if (ival > 1000 || ival < 0) {
              return "flushwait must be <= 1000, or 0 for system default of 10 millseconds.";
          }
          if (ival == 0)
              worker->flush_wait = PROXY_FLUSH_WAIT;
          else
              worker->flush_wait = ival * 1000;    /* change to microseconds */
      }
      else if (!strcasecmp(key, "lbset")) {
          ival = atoi(val);
          if (ival < 0 || ival > 99)
              return "lbset must be between 0 and 99";
          worker->lbset = ival;
      }
      else if (!strcasecmp(key, "ping")) {
          /* Ping/Pong timeout in given unit (default is second).
           */
          if (ap_timeout_parameter_parse(val, &timeout, "s") != APR_SUCCESS)
              return "Ping/Pong timeout has wrong format";
          if (timeout < 1000)
              return "Ping/Pong timeout must be at least one millisecond";
          worker->ping_timeout = timeout;
          worker->ping_timeout_set = 1;
      }
      else if (!strcasecmp(key, "connectiontimeout")) {
          /* Request timeout in given unit (default is second).
           * Defaults to connection timeout
           */
          if (ap_timeout_parameter_parse(val, &timeout, "s") != APR_SUCCESS)
              return "Connectiontimeout has wrong format";
          if (timeout < 1000)
              return "Connectiontimeout must be at least one millisecond.";
          worker->conn_timeout = timeout;
          worker->conn_timeout_set = 1;
      }
      else {
          return "unknown Worker parameter";
      }
      return NULL;
  }
  
  static const char *set_balancer_param(proxy_server_conf *conf,
                                        apr_pool_t *p,
                                        proxy_balancer *balancer,
                                        const char *key,
                                        const char *val)
  {
  
      int ival;
      if (!strcasecmp(key, "stickysession")) {
          /* Balancer sticky session name.
           * Set to something like JSESSIONID or
           * PHPSESSIONID, etc..,
           */
          balancer->sticky = apr_pstrdup(p, val);
      }
      else if (!strcasecmp(key, "nofailover")) {
          /* If set to 'on' the session will break
           * if the worker is in error state or
           * disabled.
           */
          if (!strcasecmp(val, "on"))
              balancer->sticky_force = 1;
          else if (!strcasecmp(val, "off"))
              balancer->sticky_force = 0;
          else
              return "failover must be On|Off";
      }
      else if (!strcasecmp(key, "timeout")) {
          /* Balancer timeout in seconds.
           * If set this will be the maximum time to
           * wait for a free worker.
           * Default is not to wait.
           */
          ival = atoi(val);
          if (ival < 1)
              return "timeout must be at least one second";
          balancer->timeout = apr_time_from_sec(ival);
      }
      else if (!strcasecmp(key, "maxattempts")) {
          /* Maximum number of failover attempts before
           * giving up.
           */
          ival = atoi(val);
          if (ival < 0)
              return "maximum number of attempts must be a positive number";
          balancer->max_attempts = ival;
          balancer->max_attempts_set = 1;
      }
      else if (!strcasecmp(key, "lbmethod")) {
          proxy_balancer_method *provider;
          provider = ap_lookup_provider(PROXY_LBMETHOD, val, "0");
          if (provider) {
              balancer->lbmethod = provider;
              return NULL;
          }
          return "unknown lbmethod";
      }
      else if (!strcasecmp(key, "scolonpathdelim")) {
          /* If set to 'on' then ';' will also be
           * used as a session path separator/delim (ala
           * mod_jk)
           */
          if (!strcasecmp(val, "on"))
              balancer->scolonsep = 1;
          else if (!strcasecmp(val, "off"))
              balancer->scolonsep = 0;
          else
              return "scolonpathdelim must be On|Off";
      }
      else if (!strcasecmp(key, "failonstatus")) {
          char *val_split;
          char *status;
          char *tok_state;
  
          val_split = apr_pstrdup(p, val);
  
          balancer->errstatuses = apr_array_make(p, 1, sizeof(int));
  
          status = apr_strtok(val_split, ", ", &tok_state);
          while (status != NULL) {
              ival = atoi(status);
              if (ap_is_HTTP_VALID_RESPONSE(ival)) {
                  *(int *)apr_array_push(balancer->errstatuses) = ival;
              }
              else {
                  return "failonstatus must be one or more HTTP response codes";
              }
              status = apr_strtok(NULL, ", ", &tok_state);
          }
  
      }
      else {
          return "unknown Balancer parameter";
      }
      return NULL;
  }
  
  #ifndef APACHE2NGINX
  static int alias_match(const char *uri, const char *alias_fakename)
  {
      const char *end_fakename = alias_fakename + strlen(alias_fakename);
      const char *aliasp = alias_fakename, *urip = uri;
      const char *end_uri = uri + strlen(uri);
  
      while (aliasp < end_fakename && urip < end_uri) {
          if (*aliasp == '/') {
              /* any number of '/' in the alias matches any number in
               * the supplied URI, but there must be at least one...
               */
              if (*urip != '/')
                  return 0;
  
              while (*aliasp == '/')
                  ++aliasp;
              while (*urip == '/')
                  ++urip;
          }
          else {
              /* Other characters are compared literally */
              if (*urip++ != *aliasp++)
                  return 0;
          }
      }
  
      /* fixup badly encoded stuff (e.g. % as last character) */
      if (aliasp > end_fakename) {
          aliasp = end_fakename;
      }
      if (urip > end_uri) {
          urip = end_uri;
      }
  
     /* We reach the end of the uri before the end of "alias_fakename"
      * for example uri is "/" and alias_fakename "/examples"
      */
     if (urip == end_uri && aliasp!=end_fakename) {
         return 0;
     }
  
      /* Check last alias path component matched all the way */
      if (aliasp[-1] != '/' && *urip != '\0' && *urip != '/')
          return 0;
  
      /* Return number of characters from URI which matched (may be
       * greater than length of alias, since we may have matched
       * doubled slashes)
       */
  
      return urip - uri;
  }
  #endif // APACHE2NGINX
  
  
  #ifndef APACHE2NGINX
  
  /* Detect if an absoluteURI should be proxied or not.  Note that we
   * have to do this during this phase because later phases are
   * "short-circuiting"... i.e. translate_names will end when the first
   * module returns OK.  So for example, if the request is something like:
   *
   * GET http://othervhost/cgi-bin/printenv HTTP/1.0
   *
   * mod_alias will notice the /cgi-bin part and ScriptAlias it and
   * short-circuit the proxy... just because of the ordering in the
   * configuration file.
   */
  static int proxy_detect(request_rec *r)
  {
      void *sconf = r->server->module_config;
      proxy_server_conf *conf =
          (proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
  
      /* Ick... msvc (perhaps others) promotes ternary short results to int */
  
      if (conf->req && r->parsed_uri.scheme) {
          /* but it might be something vhosted */
          if (!(r->parsed_uri.hostname
                && !strcasecmp(r->parsed_uri.scheme, ap_http_scheme(r))
                && ap_matches_request_vhost(r, r->parsed_uri.hostname,
                                            (apr_port_t)(r->parsed_uri.port_str ? r->parsed_uri.port
                                                         : ap_default_port(r))))) {
              r->proxyreq = PROXYREQ_PROXY;
              r->uri = r->unparsed_uri;
              r->filename = apr_pstrcat(r->pool, "proxy:", r->uri, NULL);
              r->handler = "proxy-server";
          }
      }
      /* We need special treatment for CONNECT proxying: it has no scheme part */
      else if (conf->req && r->method_number == M_CONNECT
               && r->parsed_uri.hostname
               && r->parsed_uri.port_str) {
          r->proxyreq = PROXYREQ_PROXY;
          r->uri = r->unparsed_uri;
          r->filename = apr_pstrcat(r->pool, "proxy:", r->uri, NULL);
          r->handler = "proxy-server";
      }
      return DECLINED;
  }
  
  static const char *proxy_interpolate(request_rec *r, const char *str)
  {
      /* Interpolate an env str in a configuration string
       * Syntax ${var} --> value_of(var)
       * Method: replace one var, and recurse on remainder of string
       * Nothing clever here, and crap like nested vars may do silly things
       * but we'll at least avoid sending the unwary into a loop
       */
      const char *start;
      const char *end;
      const char *var;
      const char *val;
      const char *firstpart;
  
      start = ap_strstr_c(str, "${");
      if (start == NULL) {
          return str;
      }
      end = ap_strchr_c(start+2, '}');
      if (end == NULL) {
          return str;
      }
      /* OK, this is syntax we want to interpolate.  Is there such a var ? */
      var = apr_pstrndup(r->pool, start+2, end-(start+2));
      val = apr_table_get(r->subprocess_env, var);
      firstpart = apr_pstrndup(r->pool, str, (start-str));
  
      if (val == NULL) {
          return apr_pstrcat(r->pool, firstpart,
                             proxy_interpolate(r, end+1), NULL);
      }
      else {
          return apr_pstrcat(r->pool, firstpart, val,
                             proxy_interpolate(r, end+1), NULL);
      }
  }
  static apr_array_header_t *proxy_vars(request_rec *r,
                                        apr_array_header_t *hdr)
  {
      int i;
      apr_array_header_t *ret = apr_array_make(r->pool, hdr->nelts,
                                               sizeof (struct proxy_alias));
      struct proxy_alias *old = (struct proxy_alias *) hdr->elts;
  
      for (i = 0; i < hdr->nelts; ++i) {
          struct proxy_alias *newcopy = apr_array_push(ret);
          newcopy->fake = (old[i].flags & PROXYPASS_INTERPOLATE)
                          ? proxy_interpolate(r, old[i].fake) : old[i].fake;
          newcopy->real = (old[i].flags & PROXYPASS_INTERPOLATE)
                          ? proxy_interpolate(r, old[i].real) : old[i].real;
      }
      return ret;
  }
  static int proxy_trans(request_rec *r)
  {
      void *sconf = r->server->module_config;
      proxy_server_conf *conf =
      (proxy_server_conf *) ap_get_module_config(sconf, &proxy_module);
      int i, len;
      struct proxy_alias *ent = (struct proxy_alias *) conf->aliases->elts;
      proxy_dir_conf *dconf = ap_get_module_config(r->per_dir_config,
                                                   &proxy_module);
      const char *fake;
      const char *real;
      ap_regmatch_t regm[AP_MAX_REG_MATCH];
      ap_regmatch_t reg1[AP_MAX_REG_MATCH];
      char *found = NULL;
      int mismatch = 0;
  
      if (r->proxyreq) {
          /* someone has already set up the proxy, it was possibly ourselves
           * in proxy_detect
           */
          return OK;
      }
  
      if ((r->unparsed_uri[0] == '*' && r->unparsed_uri[1] == '\0')
          || !r->uri || r->uri[0] != '/') {
          return DECLINED;
      }
  
      /* XXX: since r->uri has been manipulated already we're not really
       * compliant with RFC1945 at this point.  But this probably isn't
       * an issue because this is a hybrid proxy/origin server.
       */
  
      for (i = 0; i < conf->aliases->nelts; i++) {
          unsigned int nocanon = ent[i].flags & PROXYPASS_NOCANON;
          const char *use_uri = nocanon ? r->unparsed_uri : r->uri;
          if ((dconf->interpolate_env == 1)
              && (ent[i].flags & PROXYPASS_INTERPOLATE)) {
              fake = proxy_interpolate(r, ent[i].fake);
              real = proxy_interpolate(r, ent[i].real);
          }
          else {
              fake = ent[i].fake;
              real = ent[i].real;
          }
          if (ent[i].regex) {
              if (!ap_regexec(ent[i].regex, r->uri, AP_MAX_REG_MATCH, regm, 0)) {
                  if ((real[0] == '!') && (real[1] == '\0')) {
                      return DECLINED;
                  }
                  /* test that we haven't reduced the URI */
                  if (nocanon && ap_regexec(ent[i].regex, r->unparsed_uri,
                                            AP_MAX_REG_MATCH, reg1, 0)) {
                      mismatch = 1;
                      use_uri = r->uri;
                  }
                  found = ap_pregsub(r->pool, real, use_uri, AP_MAX_REG_MATCH,
                                     (use_uri == r->uri) ? regm : reg1);
                  /* Note: The strcmp() below catches cases where there
                   * was no regex substitution. This is so cases like:
                   *
                   *    ProxyPassMatch \.gif balancer://foo
                   *
                   * will work "as expected". The upshot is that the 2
                   * directives below act the exact same way (ie: $1 is implied):
                   *
                   *    ProxyPassMatch ^(/.*\.gif)$ balancer://foo
                   *    ProxyPassMatch ^(/.*\.gif)$ balancer://foo$1
                   *
                   * which may be confusing.
                   */
                  if (found && strcmp(found, real)) {
                      found = apr_pstrcat(r->pool, "proxy:", found, NULL);
                  }
                  else {
                      found = apr_pstrcat(r->pool, "proxy:", real,
                                          use_uri, NULL);
                  }
              }
          }
          else {
              len = alias_match(r->uri, fake);
  
              if (len != 0) {
                  if ((real[0] == '!') && (real[1] == '\0')) {
                      return DECLINED;
                  }
                  if (nocanon
                      && len != alias_match(r->unparsed_uri, ent[i].fake)) {
                      mismatch = 1;
                      use_uri = r->uri;
                  }
                  found = apr_pstrcat(r->pool, "proxy:", real,
                                      use_uri + len, NULL);
              }
          }
          if (mismatch) {
              /* We made a reducing transformation, so we can't safely use
               * unparsed_uri.  Safe fallback is to ignore nocanon.
               */
              ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, r,
                            "Unescaped URL path matched ProxyPass; ignoring unsafe nocanon");
          }
  
          if (found) {
              r->filename = found;
              r->handler = "proxy-server";
              r->proxyreq = PROXYREQ_REVERSE;
              if (nocanon && !mismatch) {
                  /* mod_proxy_http needs to be told.  Different module. */
                  apr_table_setn(r->notes, "proxy-nocanon", "1");
              }
              return OK;
          }
      }
      return DECLINED;
  }
  
  static int proxy_walk(request_rec *r)
  {
      proxy_server_conf *sconf = ap_get_module_config(r->server->module_config,
                                                      &proxy_module);
      ap_conf_vector_t *per_dir_defaults = r->server->lookup_defaults;
      ap_conf_vector_t **sec_proxy = (ap_conf_vector_t **) sconf->sec_proxy->elts;
      ap_conf_vector_t *entry_config;
      proxy_dir_conf *entry_proxy;
      int num_sec = sconf->sec_proxy->nelts;
      /* XXX: shouldn't we use URI here?  Canonicalize it first?
       * Pass over "proxy:" prefix
       */
      const char *proxyname = r->filename + 6;
      int j;
  
      for (j = 0; j < num_sec; ++j)
      {
          entry_config = sec_proxy[j];
          entry_proxy = ap_get_module_config(entry_config, &proxy_module);
  
          /* XXX: What about case insensitive matching ???
           * Compare regex, fnmatch or string as appropriate
           * If the entry doesn't relate, then continue
           */
          if (entry_proxy->r
                ? ap_regexec(entry_proxy->r, proxyname, 0, NULL, 0)
                : (entry_proxy->p_is_fnmatch
                     ? apr_fnmatch(entry_proxy->p, proxyname, 0)
                     : strncmp(proxyname, entry_proxy->p,
                                          strlen(entry_proxy->p)))) {
              continue;
          }
          per_dir_defaults = ap_merge_per_dir_configs(r->pool, per_dir_defaults,
                                                               entry_config);
      }
  
      r->per_dir_config = per_dir_defaults;
  
      return OK;
  }
  
  static int proxy_map_location(request_rec *r)
  {
      int access_status;
  
      if (!r->proxyreq || !r->filename || strncmp(r->filename, "proxy:", 6) != 0)
          return DECLINED;
  
      /* Don't let the core or mod_http map_to_storage hooks handle this,
       * We don't need directory/file_walk, and we want to TRACE on our own.
       */
      if ((access_status = proxy_walk(r))) {
          ap_die(access_status, r);
          return access_status;
      }
  
      return OK;
  }
  
  /* -------------------------------------------------------------- */
  /* Fixup the filename */
  
  /*
   * Canonicalise the URL
   */
  static int proxy_fixup(request_rec *r)
  {
      char *url, *p;
      int access_status;
      proxy_dir_conf *dconf = ap_get_module_config(r->per_dir_config,
                                                   &proxy_module);
  
      if (!r->proxyreq || !r->filename || strncmp(r->filename, "proxy:", 6) != 0)
          return DECLINED;
  
      /* XXX: Shouldn't we try this before we run the proxy_walk? */
      url = &r->filename[6];
  
      if ((dconf->interpolate_env == 1) && (r->proxyreq == PROXYREQ_REVERSE)) {
          /* create per-request copy of reverse proxy conf,
           * and interpolate vars in it
           */
          proxy_req_conf *rconf = apr_palloc(r->pool, sizeof(proxy_req_conf));
          ap_set_module_config(r->request_config, &proxy_module, rconf);
          rconf->raliases = proxy_vars(r, dconf->raliases);
          rconf->cookie_paths = proxy_vars(r, dconf->cookie_paths);
          rconf->cookie_domains = proxy_vars(r, dconf->cookie_domains);
      }
  
      /* canonicalise each specific scheme */
      if ((access_status = proxy_run_canon_handler(r, url))) {
          return access_status;
      }
  
      p = strchr(url, ':');
      if (p == NULL || p == url)
          return HTTP_BAD_REQUEST;
  
      return OK;      /* otherwise; we've done the best we can */
  }
  /* Send a redirection if the request contains a hostname which is not */
  /* fully qualified, i.e. doesn't have a domain name appended. Some proxy */
  /* servers like Netscape's allow this and access hosts from the local */
  /* domain in this case. I think it is better to redirect to a FQDN, since */
  /* these will later be found in the bookmarks files. */
  /* The "ProxyDomain" directive determines what domain will be appended */
  static int proxy_needsdomain(request_rec *r, const char *url, const char *domain)
  {
      char *nuri;
      const char *ref;
  
      /* We only want to worry about GETs */
      if (!r->proxyreq || r->method_number != M_GET || !r->parsed_uri.hostname)
          return DECLINED;
  
      /* If host does contain a dot already, or it is "localhost", decline */
      if (strchr(r->parsed_uri.hostname, '.') != NULL
       || strcasecmp(r->parsed_uri.hostname, "localhost") == 0)
          return DECLINED;    /* host name has a dot already */
  
      ref = apr_table_get(r->headers_in, "Referer");
  
      /* Reassemble the request, but insert the domain after the host name */
      /* Note that the domain name always starts with a dot */
      r->parsed_uri.hostname = apr_pstrcat(r->pool, r->parsed_uri.hostname,
                                           domain, NULL);
      nuri = apr_uri_unparse(r->pool,
                             &r->parsed_uri,
                             APR_URI_UNP_REVEALPASSWORD);
  
      apr_table_set(r->headers_out, "Location", nuri);
      ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r,
                    "Domain missing: %s sent to %s%s%s", r->uri,
                    apr_uri_unparse(r->pool, &r->parsed_uri,
                                    APR_URI_UNP_OMITUSERINFO),
                    ref ? " from " : "", ref ? ref : "");
  
      return HTTP_MOVED_PERMANENTLY;
  }
  
  /* -------------------------------------------------------------- */
  /* Invoke handler */
  
  static int proxy_handler(request_rec *r)
  {
      char *uri, *scheme, *p;
      const char *p2;
      void *sconf = r->server->module_config;
      proxy_server_conf *conf = (proxy_server_conf *)
          ap_get_module_config(sconf, &proxy_module);
      apr_array_header_t *proxies = conf->proxies;
      struct proxy_remote *ents = (struct proxy_remote *) proxies->elts;
      int i, rc, access_status;
      int direct_connect = 0;
      const char *str;
      long maxfwd;
      proxy_balancer *balancer = NULL;
      proxy_worker *worker = NULL;
      int attempts = 0, max_attempts = 0;
      struct dirconn_entry *list = (struct dirconn_entry *)conf->dirconn->elts;
  
      /* is this for us? */
      if (!r->proxyreq || !r->filename || strncmp(r->filename, "proxy:", 6) != 0)
          return DECLINED;
  
      /* handle max-forwards / OPTIONS / TRACE */
      if ((str = apr_table_get(r->headers_in, "Max-Forwards"))) {
          maxfwd = strtol(str, NULL, 10);
          if (maxfwd < 1) {
              switch (r->method_number) {
              case M_TRACE: {
                  int access_status;
                  r->proxyreq = PROXYREQ_NONE;
                  if ((access_status = ap_send_http_trace(r)))
                      ap_die(access_status, r);
                  else
                      ap_finalize_request_protocol(r);
                  return OK;
              }
              case M_OPTIONS: {
                  int access_status;
                  r->proxyreq = PROXYREQ_NONE;
                  if ((access_status = ap_send_http_options(r)))
                      ap_die(access_status, r);
                  else
                      ap_finalize_request_protocol(r);
                  return OK;
              }
              default: {
                  return ap_proxyerror(r, HTTP_BAD_GATEWAY,
                                       "Max-Forwards has reached zero - proxy loop?");
              }
              }
          }
          maxfwd = (maxfwd > 0) ? maxfwd - 1 : 0;
      }
      else {
          /* set configured max-forwards */
          maxfwd = conf->maxfwd;
      }
      if (maxfwd >= 0) {
          apr_table_set(r->headers_in, "Max-Forwards",
                        apr_psprintf(r->pool, "%ld", maxfwd));
      }
  
      if (r->method_number == M_TRACE) {
          core_server_config *coreconf = (core_server_config *)
                              ap_get_module_config(sconf, &core_module);
  
          if (coreconf->trace_enable == AP_TRACE_DISABLE)
          {
              /* Allow "error-notes" string to be printed by ap_send_error_response()
               * Note; this goes nowhere, canned error response need an overhaul.
               */
              apr_table_setn(r->notes, "error-notes",
                             "TRACE forbidden by server configuration");
              apr_table_setn(r->notes, "verbose-error-to", "*");
              ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                            "proxy: TRACE forbidden by server configuration");
              return HTTP_METHOD_NOT_ALLOWED;
          }
  
          /* Can't test ap_should_client_block, we aren't ready to send
           * the client a 100 Continue response till the connection has
           * been established
           */
          if (coreconf->trace_enable != AP_TRACE_EXTENDED
              && (r->read_length || r->read_chunked || r->remaining))
          {
              /* Allow "error-notes" string to be printed by ap_send_error_response()
               * Note; this goes nowhere, canned error response need an overhaul.
               */
              apr_table_setn(r->notes, "error-notes",
                             "TRACE with request body is not allowed");
              apr_table_setn(r->notes, "verbose-error-to", "*");
              ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
                            "proxy: TRACE with request body is not allowed");
              return HTTP_REQUEST_ENTITY_TOO_LARGE;
          }
      }
  
      uri = r->filename + 6;
      p = strchr(uri, ':');
      if (p == NULL) {
          ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
                        "proxy_handler no URL in %s", r->filename);
          return HTTP_BAD_REQUEST;
      }
  
      /* If the host doesn't have a domain name, add one and redirect. */
      if (conf->domain != NULL) {
          rc = proxy_needsdomain(r, uri, conf->domain);
          if (ap_is_HTTP_REDIRECT(rc))
              return HTTP_MOVED_PERMANENTLY;
      }
  
      scheme = apr_pstrndup(r->pool, uri, p - uri);
      /* Check URI's destination host against NoProxy hosts */
      /* Bypass ProxyRemote server lookup if configured as NoProxy */
      for (direct_connect = i = 0; i < conf->dirconn->nelts &&
                                          !direct_connect; i++) {
          direct_connect = list[i].matcher(&list[i], r);
      }
  #if DEBUGGING
      ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
                  (direct_connect) ? "NoProxy for %s" : "UseProxy for %s",
                  r->uri);
  #endif
  
      do {
          char *url = uri;
          /* Try to obtain the most suitable worker */
          access_status = ap_proxy_pre_request(&worker, &balancer, r, conf, &url);
          if (access_status != OK) {
              /*
               * Only return if access_status is not HTTP_SERVICE_UNAVAILABLE
               * This gives other modules the chance to hook into the
               * request_status hook and decide what to do in this situation.
               */
              if (access_status != HTTP_SERVICE_UNAVAILABLE)
                  return access_status;
              /*
               * Ensure that balancer is NULL if worker is NULL to prevent
               * potential problems in the post_request hook.
               */
              if (!worker)
                  balancer = NULL;
              goto cleanup;
          }
          if (balancer && balancer->max_attempts_set && !max_attempts)
              max_attempts = balancer->max_attempts;
          /* firstly, try a proxy, unless a NoProxy directive is active */
          if (!direct_connect) {
              for (i = 0; i < proxies->nelts; i++) {
                  p2 = ap_strchr_c(ents[i].scheme, ':');  /* is it a partial URL? */
                  if (strcmp(ents[i].scheme, "*") == 0 ||
                      (ents[i].use_regex &&
                       ap_regexec(ents[i].regexp, url, 0, NULL, 0) == 0) ||
                      (p2 == NULL && strcasecmp(scheme, ents[i].scheme) == 0) ||
                      (p2 != NULL &&
                      strncasecmp(url, ents[i].scheme,
                                  strlen(ents[i].scheme)) == 0)) {
  
                      /* handle the scheme */
                      ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
                                   "Trying to run scheme_handler against proxy");
                      access_status = proxy_run_scheme_handler(r, worker,
                                                               conf, url,
                                                               ents[i].hostname,
                                                               ents[i].port);
  
                      /* Did the scheme handler process the request? */
                      if (access_status != DECLINED) {
                          const char *cl_a;
                          char *end;
                          apr_off_t cl;
  
                          /*
                           * An fatal error or success, so no point in
                           * retrying with a direct connection.
                           */
                          if (access_status != HTTP_BAD_GATEWAY) {
                              goto cleanup;
                          }
                          cl_a = apr_table_get(r->headers_in, "Content-Length");
                          if (cl_a) {
                              apr_strtoff(&cl, cl_a, &end, 0);
                              /*
                               * The request body is of length > 0. We cannot
                               * retry with a direct connection since we already
                               * sent (parts of) the request body to the proxy
                               * and do not have any longer.
                               */
                              if (cl > 0) {
                                  goto cleanup;
                              }
                          }
                          /*
                           * Transfer-Encoding was set as input header, so we had
                           * a request body. We cannot retry with a direct
                           * connection for the same reason as above.
                           */
                          if (apr_table_get(r->headers_in, "Transfer-Encoding")) {
                              goto cleanup;
                          }
                      }
                  }
              }
          }
  
          /* otherwise, try it direct */
          /* N.B. what if we're behind a firewall, where we must use a proxy or
          * give up??
          */
  
          /* handle the scheme */
          ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
                       "Running scheme %s handler (attempt %d)",
                       scheme, attempts);
          access_status = proxy_run_scheme_handler(r, worker, conf,
                                                   url, NULL, 0);
          if (access_status == OK)
              break;
          else if (access_status == HTTP_INTERNAL_SERVER_ERROR) {
              /* Unrecoverable server error.
               * We can not failover to another worker.
               * Mark the worker as unusable if member of load balancer
               */
              if (balancer) {
                  worker->s->status |= PROXY_WORKER_IN_ERROR;
                  worker->s->error_time = apr_time_now();
              }
              break;
          }
          else if (access_status == HTTP_SERVICE_UNAVAILABLE) {
              /* Recoverable server error.
               * We can failover to another worker
               * Mark the worker as unusable if member of load balancer
               */
              if (balancer) {
                  worker->s->status |= PROXY_WORKER_IN_ERROR;
                  worker->s->error_time = apr_time_now();
              }
          }
          else {
              /* Unrecoverable error.
               * Return the origin status code to the client.
               */
              break;
          }
          /* Try again if the worker is unusable and the service is
           * unavailable.
           */
      } while (!PROXY_WORKER_IS_USABLE(worker) &&
               max_attempts > attempts++);
  
      if (DECLINED == access_status) {
          ap_log_error(APLOG_MARK, APLOG_WARNING, 0, r->server,
                      "proxy: No protocol handler was valid for the URL %s. "
                      "If you are using a DSO version of mod_proxy, make sure "
                      "the proxy submodules are included in the configuration "
                      "using LoadModule.", r->uri);
          access_status = HTTP_INTERNAL_SERVER_ERROR;
          goto cleanup;
      }
  cleanup:
      if (balancer) {
          int post_status = proxy_run_post_request(worker, balancer, r, conf);
          if (post_status == DECLINED) {
              post_status = OK; /* no post_request handler available */
              /* TODO: recycle direct worker */
          }
      }
  
      proxy_run_request_status(&access_status, r);
  
      return access_status;
  }
  
  #endif // APACHE2NGINX
  
  /* -------------------------------------------------------------- */
  /* Setup configurable data */
  
  static void * create_proxy_config(apr_pool_t *p, server_rec *s)
  {
      proxy_server_conf *ps = apr_pcalloc(p, sizeof(proxy_server_conf));
  
      ps->sec_proxy = apr_array_make(p, 10, sizeof(ap_conf_vector_t *));
      ps->proxies = apr_array_make(p, 10, sizeof(struct proxy_remote));
      ps->aliases = apr_array_make(p, 10, sizeof(struct proxy_alias));
      ps->noproxies = apr_array_make(p, 10, sizeof(struct noproxy_entry));
      ps->dirconn = apr_array_make(p, 10, sizeof(struct dirconn_entry));
      ps->allowed_connect_ports = apr_array_make(p, 10, sizeof(int));
      ps->workers = apr_array_make(p, 10, sizeof(proxy_worker));
      ps->balancers = apr_array_make(p, 10, sizeof(proxy_balancer));
      ps->forward = NULL;
      ps->reverse = NULL;
      ps->domain = NULL;
      ps->viaopt = via_off; /* initially backward compatible with 1.3.1 */
      ps->viaopt_set = 0; /* 0 means default */
      ps->req = 0;
      ps->req_set = 0;
      ps->recv_buffer_size = 0; /* this default was left unset for some reason */
      ps->recv_buffer_size_set = 0;
      ps->io_buffer_size = AP_IOBUFSIZE;
      ps->io_buffer_size_set = 0;
      ps->maxfwd = DEFAULT_MAX_FORWARDS;
      ps->maxfwd_set = 0;
      ps->error_override = 0;
      ps->error_override_set = 0;
      ps->preserve_host_set = 0;
      ps->preserve_host = 0;
      ps->timeout = 0;
      ps->timeout_set = 0;
      ps->badopt = bad_error;
      ps->badopt_set = 0;
      ps->pool = p;
  
      return ps;
  }
  
  static void * merge_proxy_config(apr_pool_t *p, void *basev, void *overridesv)
  {
      proxy_server_conf *ps = apr_pcalloc(p, sizeof(proxy_server_conf));
      proxy_server_conf *base = (proxy_server_conf *) basev;
      proxy_server_conf *overrides = (proxy_server_conf *) overridesv;
  
      ps->proxies = apr_array_append(p, base->proxies, overrides->proxies);
      ps->sec_proxy = apr_array_append(p, base->sec_proxy, overrides->sec_proxy);
      ps->aliases = apr_array_append(p, base->aliases, overrides->aliases);
      ps->noproxies = apr_array_append(p, base->noproxies, overrides->noproxies);
      ps->dirconn = apr_array_append(p, base->dirconn, overrides->dirconn);
      ps->allowed_connect_ports = apr_array_append(p, base->allowed_connect_ports, overrides->allowed_connect_ports);
      ps->workers = apr_array_append(p, base->workers, overrides->workers);
      ps->balancers = apr_array_append(p, base->balancers, overrides->balancers);
      ps->forward = overrides->forward ? overrides->forward : base->forward;
      ps->reverse = overrides->reverse ? overrides->reverse : base->reverse;
  
      ps->domain = (overrides->domain == NULL) ? base->domain : overrides->domain;
      ps->viaopt = (overrides->viaopt_set == 0) ? base->viaopt : overrides->viaopt;
      ps->viaopt_set = overrides->viaopt_set || base->viaopt_set;
      ps->req = (overrides->req_set == 0) ? base->req : overrides->req;
      ps->req_set = overrides->req_set || base->req_set;
      ps->recv_buffer_size = (overrides->recv_buffer_size_set == 0) ? base->recv_buffer_size : overrides->recv_buffer_size;
      ps->recv_buffer_size_set = overrides->recv_buffer_size_set || base->recv_buffer_size_set;
      ps->io_buffer_size = (overrides->io_buffer_size_set == 0) ? base->io_buffer_size : overrides->io_buffer_size;
      ps->io_buffer_size_set = overrides->io_buffer_size_set || base->io_buffer_size_set;
      ps->maxfwd = (overrides->maxfwd_set == 0) ? base->maxfwd : overrides->maxfwd;
      ps->maxfwd_set = overrides->maxfwd_set || base->maxfwd_set;
      ps->error_override = (overrides->error_override_set == 0) ? base->error_override : overrides->error_override;
      ps->error_override_set = overrides->error_override_set || base->error_override_set;
      ps->preserve_host = (overrides->preserve_host_set == 0) ? base->preserve_host : overrides->preserve_host;
      ps->preserve_host_set = overrides->preserve_host_set || base->preserve_host_set;
      ps->timeout= (overrides->timeout_set == 0) ? base->timeout : overrides->timeout;
      ps->timeout_set = overrides->timeout_set || base->timeout_set;
      ps->badopt = (overrides->badopt_set == 0) ? base->badopt : overrides->badopt;
      ps->badopt_set = overrides->badopt_set || base->badopt_set;
      ps->proxy_status = (overrides->proxy_status_set == 0) ? base->proxy_status : overrides->proxy_status;
      ps->proxy_status_set = overrides->proxy_status_set || base->proxy_status_set;
      ps->pool = p;
      return ps;
  }
  
  static void *create_proxy_dir_config(apr_pool_t *p, char *dummy)
  {
      proxy_dir_conf *new =
          (proxy_dir_conf *) apr_pcalloc(p, sizeof(proxy_dir_conf));
  
      /* Filled in by proxysection, when applicable */
  
      /* Put these in the dir config so they work inside <Location> */
      new->raliases = apr_array_make(p, 10, sizeof(struct proxy_alias));
      new->cookie_paths = apr_array_make(p, 10, sizeof(struct proxy_alias));
      new->cookie_domains = apr_array_make(p, 10, sizeof(struct proxy_alias));
      new->cookie_path_str = apr_strmatch_precompile(p, "path=", 0);
      new->cookie_domain_str = apr_strmatch_precompile(p, "domain=", 0);
      new->interpolate_env = -1; /* unset */
  
      return (void *) new;
  }
  
  static void *merge_proxy_dir_config(apr_pool_t *p, void *basev, void *addv)
  {
      proxy_dir_conf *new = (proxy_dir_conf *) apr_pcalloc(p, sizeof(proxy_dir_conf));
      proxy_dir_conf *add = (proxy_dir_conf *) addv;
      proxy_dir_conf *base = (proxy_dir_conf *) basev;
  
      new->p = add->p;
      new->p_is_fnmatch = add->p_is_fnmatch;
      new->r = add->r;
  
      /* Put these in the dir config so they work inside <Location> */
      new->raliases = apr_array_append(p, base->raliases, add->raliases);
      new->cookie_paths
          = apr_array_append(p, base->cookie_paths, add->cookie_paths);
      new->cookie_domains
          = apr_array_append(p, base->cookie_domains, add->cookie_domains);
      new->cookie_path_str = base->cookie_path_str;
      new->cookie_domain_str = base->cookie_domain_str;
      new->interpolate_env = (add->interpolate_env == -1) ? base->interpolate_env
                                                          : add->interpolate_env;
      new->ftp_directory_charset = add->ftp_directory_charset ?
                                   add->ftp_directory_charset :
                                   base->ftp_directory_charset;
      return new;
  }
  
  
  static const char *
      add_proxy(cmd_parms *cmd, void *dummy, const char *f1, const char *r1, int regex)
  {
      server_rec *s = cmd->server;
      proxy_server_conf *conf =
      (proxy_server_conf *) ap_get_module_config(s->module_config, &proxy_module);
      struct proxy_remote *new;
      char *p, *q;
      char *r, *f, *scheme;
      ap_regex_t *reg = NULL;
      int port;
  
      r = apr_pstrdup(cmd->pool, r1);
      scheme = apr_pstrdup(cmd->pool, r1);
      f = apr_pstrdup(cmd->pool, f1);
      p = strchr(r, ':');
      if (p == NULL || p[1] != '/' || p[2] != '/' || p[3] == '\0') {
          if (regex)
              return "ProxyRemoteMatch: Bad syntax for a remote proxy server";
          else
              return "ProxyRemote: Bad syntax for a remote proxy server";
      }
      else {
          scheme[p-r] = 0;
      }
      q = strchr(p + 3, ':');
      if (q != NULL) {
          if (sscanf(q + 1, "%u", &port) != 1 || port > 65535) {
              if (regex)
                  return "ProxyRemoteMatch: Bad syntax for a remote proxy server (bad port number)";
              else
                  return "ProxyRemote: Bad syntax for a remote proxy server (bad port number)";
          }
          *q = '\0';
      }
      else
          port = -1;
      *p = '\0';
      if (regex) {
          reg = ap_pregcomp(cmd->pool, f, AP_REG_EXTENDED);
          if (!reg)
              return "Regular expression for ProxyRemoteMatch could not be compiled.";
      }
      else
          if (strchr(f, ':') == NULL)
              ap_str_tolower(f);      /* lowercase scheme */
      ap_str_tolower(p + 3);      /* lowercase hostname */
  
      if (port == -1) {
          port = apr_uri_port_of_scheme(scheme);
      }
  
      new = apr_array_push(conf->proxies);
      new->scheme = f;
      new->protocol = r;
      new->hostname = p + 3;
      new->port = port;
      new->regexp = reg;
      new->use_regex = regex;
  
      apn_set_unsupport(cmd, "No relevant directive in Nginx."); 
  
      return NULL;
  }
  
  static const char *
      add_proxy_noregex(cmd_parms *cmd, void *dummy, const char *f1, const char *r1)
  {
      return add_proxy(cmd, dummy, f1, r1, 0);
  }
  
  static const char *
      add_proxy_regex(cmd_parms *cmd, void *dummy, const char *f1, const char *r1)
  {
      return add_proxy(cmd, dummy, f1, r1, 1);
  }
  
  static const char *
  cmd_ProxyPassInterpolateEnv(cmd_parms *cmd, void *struct_ptr_v, int arg)
  {
      apn_set_unsupport(cmd, "No relevant directive in Nginx.");
  
      return ap_set_flag_slot(cmd, struct_ptr_v, arg);
  }
  
  static const char *
      add_pass(cmd_parms *cmd, void *dummy, const char *arg, int is_regex)
  {
      server_rec *s = cmd->server;
      proxy_server_conf *conf =
      (proxy_server_conf *) ap_get_module_config(s->module_config, &proxy_module);
      struct proxy_alias *new;
      char *f = cmd->path;
      char *r = NULL;
      char *word;
      apr_table_t *params = apr_table_make(cmd->pool, 5);
      const apr_array_header_t *arr;
      const apr_table_entry_t *elts;
      int i;
      int use_regex = is_regex;
      unsigned int flags = 0;
  
      while (*arg) {
          word = ap_getword_conf(cmd->pool, &arg);
          if (!f) {
              if (!strcmp(word, "~")) {
                  if (is_regex) {
                      return "ProxyPassMatch invalid syntax ('~' usage).";
                  }
                  use_regex = 1;
                  continue;
              }
              f = word;
          }
          else if (!r) {
              r = word;
          }
          else if (!strcasecmp(word,"nocanon")) {
              flags |= PROXYPASS_NOCANON;
          }
          else if (!strcasecmp(word,"interpolate")) {
              flags |= PROXYPASS_INTERPOLATE;
          }
          else {
              char *val = strchr(word, '=');
              if (!val) {
                  if (cmd->path) {
                      if (*r == '/') {
                          return "ProxyPass|ProxyPassMatch can not have a path when defined in "
                                 "a location.";
                      }
                      else {
                          return "Invalid ProxyPass|ProxyPassMatch parameter. Parameter must "
                                 "be in the form 'key=value'.";
                      }
                  }
                  else {
                      return "Invalid ProxyPass|ProxyPassMatch parameter. Parameter must be "
                             "in the form 'key=value'.";
                  }
              }
              else
                  *val++ = '\0';
              apr_table_setn(params, word, val);
          }
      };
  
      if (r == NULL)
          return "ProxyPass|ProxyPassMatch needs a path when not defined in a location";
  
      if ((flags & PROXYPASS_NOCANON) && (flags & PROXYPASS_INTERPOLATE)) {
          apn_set_unsupport(cmd, "The optional nocanon and interpolate keywords are not supported in Nginx.");
      } else if (flags & PROXYPASS_NOCANON) {
          apn_set_unsupport(cmd, "The optional nocanon keyword is not supported in Nginx.");
      } else if (flags & PROXYPASS_INTERPOLATE) {
          apn_set_unsupport(cmd, "The optional interpolate keyword is not supported in Nginx.");
      }
  
      if ( ! (r[0] == '!' && r[1] == '\0') ) {
          new = apr_array_push(conf->aliases);
          new->fake = apr_pstrdup(cmd->pool, f);
          new->real = apr_pstrdup(cmd->pool, r);
          new->flags = flags;
          if (cmd->path) {
              new->is_in_dir = 1;
          } else {
              new->is_in_dir = 0;
          }
      }
  
      if (use_regex) {
          new->regex = ap_pregcomp(cmd->pool, f, AP_REG_EXTENDED);
          if (new->regex == NULL)
              return "Regular expression could not be compiled.";
      }
      else {
          new->regex = NULL;
      }
  
      if (r[0] == '!' && r[1] == '\0') {
          apn_set_unsupport(cmd, "The ! directive in ProxyPass is not supported in Nginx."); 
  
          return NULL;
      }
  
      arr = apr_table_elts(params);
      elts = (const apr_table_entry_t *)arr->elts;
      /* Distinguish the balancer from worker */
      if (strncasecmp(r, "balancer:", 9) == 0) {
          proxy_balancer *balancer = ap_proxy_get_balancer(cmd->pool, conf, r);
          if (!balancer) {
              const char *err = ap_proxy_add_balancer(&balancer,
                                                      cmd->pool,
                                                      conf, r);
              if (err)
                  return apr_pstrcat(cmd->temp_pool, "ProxyPass ", err, NULL);
          }
          for (i = 0; i < arr->nelts; i++) {
              const char *err = set_balancer_param(conf, cmd->pool, balancer, elts[i].key,
                                                   elts[i].val);
              if (err)
                  return apr_pstrcat(cmd->temp_pool, "ProxyPass ", err, NULL);
          }
      }
      else {
          proxy_worker *worker = ap_proxy_get_worker(cmd->temp_pool, conf, r);
          if (!worker) {
              const char *err = ap_proxy_add_worker(&worker, cmd->pool, conf, r);
              if (err)
                  return apr_pstrcat(cmd->temp_pool, "ProxyPass ", err, NULL);
          } else {
              ap_log_error(APLOG_MARK, APLOG_INFO, 0, cmd->server,
                           "worker %s already used by another worker", worker->name);
          }
          PROXY_COPY_CONF_PARAMS(worker, conf);
  
          for (i = 0; i < arr->nelts; i++) {
              const char *err = set_worker_param(cmd->pool, worker, elts[i].key,
                                                 elts[i].val);
              if (err)
                  return apr_pstrcat(cmd->temp_pool, "ProxyPass ", err, NULL);
          }
      }
      return NULL;
  }
  
  static const char *
      add_pass_noregex(cmd_parms *cmd, void *dummy, const char *arg)
  {
      return add_pass(cmd, dummy, arg, 0);
  }
  
  static const char *
      add_pass_regex(cmd_parms *cmd, void *dummy, const char *arg)
  {
      return add_pass(cmd, dummy, arg, 1);
  }
  
  
  static const char * add_pass_reverse(cmd_parms *cmd, void *dconf, const char *f,
                                       const char *r, const char *i)
  {
      proxy_dir_conf *conf = dconf;
      struct proxy_alias *new;
      const char *fake;
      const char *real;
      const char *interp;
  
      if (cmd->path == NULL) {
          fake = f;
          real = r;
          interp = i;
          if (r == NULL || !strcasecmp(r, "interpolate")) {
              return "ProxyPassReverse needs a path when not defined in a location";
          }
      }
      else {
          fake = cmd->path;
          real = f;
          if (r && strcasecmp(r, "interpolate")) {
              return "ProxyPassReverse can not have a path when defined in a location";
          }
          interp = r;
      }
  
      new = apr_array_push(conf->raliases);
      new->fake = fake;
      new->real = real;
      new->flags = interp ? PROXYPASS_INTERPOLATE : 0;
  
      return NULL;
  }
  static const char* cookie_path(cmd_parms *cmd, void *dconf, const char *f,
                                 const char *r, const char *interp)
  {
      proxy_dir_conf *conf = dconf;
      struct proxy_alias *new;
  
      new = apr_array_push(conf->cookie_paths);
      new->fake = f;
      new->real = r;
      new->flags = interp ? PROXYPASS_INTERPOLATE : 0;
      
      apn_set_unsupport(cmd, "No relevant directive in Nginx.");
  
      return NULL;
  }
  static const char* cookie_domain(cmd_parms *cmd, void *dconf, const char *f,
                                   const char *r, const char *interp)
  {
      proxy_dir_conf *conf = dconf;
      struct proxy_alias *new;
  
      new = apr_array_push(conf->cookie_domains);
      new->fake = f;
      new->real = r;
      new->flags = interp ? PROXYPASS_INTERPOLATE : 0;
  
      apn_set_unsupport(cmd, "No relevant directive in Nginx.");
  
      return NULL;
  }
  
  static const char *
      set_proxy_exclude(cmd_parms *parms, void *dummy, const char *arg)
  {
      server_rec *s = parms->server;
      proxy_server_conf *conf =
      ap_get_module_config(s->module_config, &proxy_module);
      struct noproxy_entry *new;
      struct noproxy_entry *list = (struct noproxy_entry *) conf->noproxies->elts;
      struct apr_sockaddr_t *addr;
      int found = 0;
      int i;
  
      /* Don't duplicate entries */
      for (i = 0; i < conf->noproxies->nelts; i++) {
          if (strcasecmp(arg, list[i].name) == 0) { /* ignore case for host names */
              found = 1;
          }
      }
  
      if (!found) {
          new = apr_array_push(conf->noproxies);
          new->name = arg;
          if (APR_SUCCESS == apr_sockaddr_info_get(&addr, new->name, APR_UNSPEC, 0, 0, parms->pool)) {
              new->addr = addr;
          }
          else {
              new->addr = NULL;
          }
      }
  
      apn_set_unsupport(parms, "No relevant directive in Nginx.");
  
      return NULL;
  }
  
  /*
   * Set the ports CONNECT can use
   */
  static const char *
      set_allowed_ports(cmd_parms *parms, void *dummy, const char *arg)
  {
      server_rec *s = parms->server;
      proxy_server_conf *conf =
          ap_get_module_config(s->module_config, &proxy_module);
      int *New;
  
      if (!apr_isdigit(arg[0]))
          return "AllowCONNECT: port number must be numeric";
  
      New = apr_array_push(conf->allowed_connect_ports);
      *New = atoi(arg);
  
      apn_set_unsupport(parms, "No relevant directive in Nginx."); 
  
      return NULL;
  }
  
  /* Similar to set_proxy_exclude(), but defining directly connected hosts,
   * which should never be accessed via the configured ProxyRemote servers
   */
  static const char *
      set_proxy_dirconn(cmd_parms *parms, void *dummy, const char *arg)
  {
      server_rec *s = parms->server;
      proxy_server_conf *conf =
      ap_get_module_config(s->module_config, &proxy_module);
      struct dirconn_entry *New;
      struct dirconn_entry *list = (struct dirconn_entry *) conf->dirconn->elts;
      int found = 0;
      int i;
  
      /* Don't duplicate entries */
      for (i = 0; i < conf->dirconn->nelts; i++) {
          if (strcasecmp(arg, list[i].name) == 0)
              found = 1;
      }
  
      if (!found) {
          New = apr_array_push(conf->dirconn);
          New->name = apr_pstrdup(parms->pool, arg);
          New->hostaddr = NULL;
  
      if (ap_proxy_is_ipaddr(New, parms->pool)) {
  #if DEBUGGING
          ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                       "Parsed addr %s", inet_ntoa(New->addr));
          ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                       "Parsed mask %s", inet_ntoa(New->mask));
  #endif
      }
      else if (ap_proxy_is_domainname(New, parms->pool)) {
          ap_str_tolower(New->name);
  #if DEBUGGING
          ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                       "Parsed domain %s", New->name);
  #endif
          }
          else if (ap_proxy_is_hostname(New, parms->pool)) {
              ap_str_tolower(New->name);
  #if DEBUGGING
              ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
                           "Parsed host %s", New->name);
  #endif
          }
          else {
              ap_proxy_is_word(New, parms->pool);
  #if DEBUGGING
              fprintf(stderr, "Parsed word %s\n", New->name);
  #endif
          }
      }
  
      apn_set_unsupport(parms, "No relevant directive in Nginx.");
  
      return NULL;
  }
  
  static const char *
      set_proxy_domain(cmd_parms *parms, void *dummy, const char *arg)
  {
      proxy_server_conf *psf =
      ap_get_module_config(parms->server->module_config, &proxy_module);
  
      if (arg[0] != '.')
          return "ProxyDomain: domain name must start with a dot.";
  
      psf->domain = arg;
  
      apn_set_unsupport(parms, "No relevant directive in Nginx.");
  
      return NULL;
  }
  
  static const char *
      set_proxy_req(cmd_parms *parms, void *dummy, int flag)
  {
      proxy_server_conf *psf =
      ap_get_module_config(parms->server->module_config, &proxy_module);
  
      psf->req = flag;
      psf->req_set = 1;
  
      if (flag && !psf->forward) {
          psf->forward = ap_proxy_create_worker(parms->pool);
          psf->forward->name     = "proxy:forward";
          psf->forward->hostname = "*";
          psf->forward->scheme   = "*";
      }
  
      apn_set_unsupport(parms, "No relevant directive in Nginx."); 
  
      return NULL;
  }
  
  static const char *
      set_proxy_error_override(cmd_parms *parms, void *dummy, int flag)
  {
      proxy_server_conf *psf =
      ap_get_module_config(parms->server->module_config, &proxy_module);
  
      psf->error_override = flag;
      psf->error_override_set = 1;
      return NULL;
  }
  static const char *
      set_preserve_host(cmd_parms *parms, void *dummy, int flag)
  {
      proxy_server_conf *psf =
      ap_get_module_config(parms->server->module_config, &proxy_module);
  
      psf->preserve_host = flag;
      psf->preserve_host_set = 1;
      return NULL;
  }
  
  static const char *
      set_recv_buffer_size(cmd_parms *parms, void *dummy, const char *arg)
  {
      proxy_server_conf *psf =
      ap_get_module_config(parms->server->module_config, &proxy_module);
      int s = atoi(arg);
      if (s < 512 && s != 0) {
          return "ProxyReceiveBufferSize must be >= 512 bytes, or 0 for system default.";
      }
  
      psf->recv_buffer_size = s;
      psf->recv_buffer_size_set = 1;
      return NULL;
  }
  
  static const char *
      set_io_buffer_size(cmd_parms *parms, void *dummy, const char *arg)
  {
      proxy_server_conf *psf =
      ap_get_module_config(parms->server->module_config, &proxy_module);
      long s = atol(arg);
  
      psf->io_buffer_size = ((s > AP_IOBUFSIZE) ? s : AP_IOBUFSIZE);
      psf->io_buffer_size_set = 1;
  
      apn_set_unsupport(parms, "No relevant directive in Nginx."); 
  
      return NULL;
  }
  
  static const char *
      set_max_forwards(cmd_parms *parms, void *dummy, const char *arg)
  {
      proxy_server_conf *psf =
      ap_get_module_config(parms->server->module_config, &proxy_module);
      long s = atol(arg);
  
      psf->maxfwd = s;
      psf->maxfwd_set = 1;
  
      apn_set_unsupport(parms, "No relevant directive in Nginx.");
  
      return NULL;
  }
  static const char*
      set_proxy_timeout(cmd_parms *parms, void *dummy, const char *arg)
  {
      proxy_server_conf *psf =
      ap_get_module_config(parms->server->module_config, &proxy_module);
      int timeout;
  
      timeout=atoi(arg);
      if (timeout<1) {
          return "Proxy Timeout must be at least 1 second.";
      }
      psf->timeout_set=1;
      psf->timeout=apr_time_from_sec(timeout);
  
      return NULL;
  }
  
  static const char*
      set_via_opt(cmd_parms *parms, void *dummy, const char *arg)
  {
      proxy_server_conf *psf =
      ap_get_module_config(parms->server->module_config, &proxy_module);
  
      if (strcasecmp(arg, "Off") == 0)
          psf->viaopt = via_off;
      else if (strcasecmp(arg, "On") == 0)
          psf->viaopt = via_on;
      else if (strcasecmp(arg, "Block") == 0)
          psf->viaopt = via_block;
      else if (strcasecmp(arg, "Full") == 0)
          psf->viaopt = via_full;
      else {
          return "ProxyVia must be one of: "
              "off | on | full | block";
      }
  
      psf->viaopt_set = 1;
  
      apn_set_unsupport(parms, "No relevant directive in Nginx.");
  
      return NULL;
  }
  
  static const char*
      set_bad_opt(cmd_parms *parms, void *dummy, const char *arg)
  {
      proxy_server_conf *psf =
      ap_get_module_config(parms->server->module_config, &proxy_module);
  
      if (strcasecmp(arg, "IsError") == 0)
          psf->badopt = bad_error;
      else if (strcasecmp(arg, "Ignore") == 0)
          psf->badopt = bad_ignore;
      else if (strcasecmp(arg, "StartBody") == 0)
          psf->badopt = bad_body;
      else {
          return "ProxyBadHeader must be one of: "
              "IsError | Ignore | StartBody";
      }
  
      psf->badopt_set = 1;
  
      apn_set_unsupport(parms, "No relevant directive in Nginx.");
  
      return NULL;
  }
  
  static const char*
      set_status_opt(cmd_parms *parms, void *dummy, const char *arg)
  {
      proxy_server_conf *psf =
      ap_get_module_config(parms->server->module_config, &proxy_module);
  
      if (strcasecmp(arg, "Off") == 0)
          psf->proxy_status = status_off;
      else if (strcasecmp(arg, "On") == 0)
          psf->proxy_status = status_on;
      else if (strcasecmp(arg, "Full") == 0)
          psf->proxy_status = status_full;
      else {
          return "ProxyStatus must be one of: "
              "off | on | full";
      }
  
      psf->proxy_status_set = 1;
  
      apn_set_unsupport(parms, "No relevant directive in Nginx.");
  
      return NULL;
  }
  
  static const char *add_member(cmd_parms *cmd, void *dummy, const char *arg)
  {
      server_rec *s = cmd->server;
      proxy_server_conf *conf =
      ap_get_module_config(s->module_config, &proxy_module);
      proxy_balancer *balancer;
      proxy_worker *worker;
      char *path = cmd->path;
      char *name = NULL;
      char *word;
      apr_table_t *params = apr_table_make(cmd->pool, 5);
      const apr_array_header_t *arr;
      const apr_table_entry_t *elts;
      int i;
  
      if (cmd->path)
          path = apr_pstrdup(cmd->pool, cmd->path);
      while (*arg) {
          word = ap_getword_conf(cmd->pool, &arg);
          if (!path)
              path = word;
          else if (!name)
              name = word;
          else {
              char *val = strchr(word, '=');
              if (!val)
                  if (cmd->path)
                      return "BalancerMember can not have a balancer name when defined in a location";
                  else
                      return "Invalid BalancerMember parameter. Parameter must "
                             "be in the form 'key=value'";
              else
                  *val++ = '\0';
              apr_table_setn(params, word, val);
          }
      }
      if (!path)
          return "BalancerMember must define balancer name when outside <Proxy > section";
      if (!name)
          return "BalancerMember must define remote proxy server";
  
      ap_str_tolower(path);   /* lowercase scheme://hostname */
  
      /* Try to find existing worker */
      worker = ap_proxy_get_worker(cmd->temp_pool, conf, name);
      if (!worker) {
          const char *err;
          if ((err = ap_proxy_add_worker(&worker, cmd->pool, conf, name)) != NULL)
              return apr_pstrcat(cmd->temp_pool, "BalancerMember ", err, NULL);
      } else {
              ap_log_error(APLOG_MARK, APLOG_INFO, 0, cmd->server,
                           "worker %s already used by another worker", worker->name);
      }
      PROXY_COPY_CONF_PARAMS(worker, conf);
  
      arr = apr_table_elts(params);
      elts = (const apr_table_entry_t *)arr->elts;
      for (i = 0; i < arr->nelts; i++) {
          const char *err = set_worker_param(cmd->pool, worker, elts[i].key,
                                             elts[i].val);
          if (err)
              return apr_pstrcat(cmd->temp_pool, "BalancerMember ", err, NULL);
      }
      /* Try to find the balancer */
      balancer = ap_proxy_get_balancer(cmd->temp_pool, conf, path);
      if (!balancer) {
          const char *err = ap_proxy_add_balancer(&balancer,
                                                  cmd->pool,
                                                  conf, path);
          if (err)
              return apr_pstrcat(cmd->temp_pool, "BalancerMember ", err, NULL);
      }
      /* Add the worker to the load balancer */
      ap_proxy_add_worker_to_balancer(cmd->pool, balancer, worker);
      return NULL;
  }
  
  static const char *
      set_proxy_param(cmd_parms *cmd, void *dummy, const char *arg)
  {
      server_rec *s = cmd->server;
      proxy_server_conf *conf =
      (proxy_server_conf *) ap_get_module_config(s->module_config, &proxy_module);
      char *name = NULL;
      char *word, *val;
      proxy_balancer *balancer = NULL;
      proxy_worker *worker = NULL;
      const char *err;
      int in_proxy_section = 0;
  
      if (cmd->directive->parent &&
          strncasecmp(cmd->directive->parent->directive,
                      "<Proxy", 6) == 0) {
          const char *pargs = cmd->directive->parent->args;
          /* Directive inside <Proxy section
           * Parent directive arg is the worker/balancer name.
           */
          name = ap_getword_conf(cmd->temp_pool, &pargs);
          if ((word = ap_strchr(name, '>')))
              *word = '\0';
          in_proxy_section = 1;
      }
      else {
          /* Standard set directive with worker/balancer
           * name as first param.
           */
          name = ap_getword_conf(cmd->temp_pool, &arg);
      }
  
      if (strncasecmp(name, "balancer:", 9) == 0) {
          balancer = ap_proxy_get_balancer(cmd->pool, conf, name);
          if (!balancer) {
              if (in_proxy_section) {
                  err = ap_proxy_add_balancer(&balancer,
                                              cmd->pool,
                                              conf, name);
                  if (err)
                      return apr_pstrcat(cmd->temp_pool, "ProxySet ",
                                         err, NULL);
              }
              else
                  return apr_pstrcat(cmd->temp_pool, "ProxySet can not find '",
                                     name, "' Balancer.", NULL);
          }
      }
      else {
          worker = ap_proxy_get_worker(cmd->temp_pool, conf, name);
          if (!worker) {
              if (in_proxy_section) {
                  err = ap_proxy_add_worker(&worker, cmd->pool,
                                            conf, name);
                  if (err)
                      return apr_pstrcat(cmd->temp_pool, "ProxySet ",
                                         err, NULL);
              }
              else
                  return apr_pstrcat(cmd->temp_pool, "ProxySet can not find '",
                                     name, "' Worker.", NULL);
          }
      }
  
      while (*arg) {
          word = ap_getword_conf(cmd->pool, &arg);
          val = strchr(word, '=');
          if (!val) {
              return "Invalid ProxySet parameter. Parameter must be "
                     "in the form 'key=value'";
          }
          else
              *val++ = '\0';
          if (worker)
              err = set_worker_param(cmd->pool, worker, word, val);
          else
              err = set_balancer_param(conf, cmd->pool, balancer, word, val);
  
          if (err)
              return apr_pstrcat(cmd->temp_pool, "ProxySet: ", err, " ", word, "=", val, "; ", name, NULL);
      }
  
      return NULL;
  }
  
  static const char *set_ftp_directory_charset(cmd_parms *cmd, void *dconf,
                                               const char *arg)
  {
      proxy_dir_conf *conf = dconf;
  
      conf->ftp_directory_charset = arg;
  
      apn_set_unsupport(cmd, "No relevant directive in Nginx."); 
  
      return NULL;
  }
  
  static void ap_add_per_proxy_conf(server_rec *s, ap_conf_vector_t *dir_config)
  {
      proxy_server_conf *sconf = ap_get_module_config(s->module_config,
                                                      &proxy_module);
      void **new_space = (void **)apr_array_push(sconf->sec_proxy);
  
      *new_space = dir_config;
  }
  
  static const char *proxysection(cmd_parms *cmd, void *mconfig, const char *arg)
  {
      const char *errmsg;
      const char *endp = ap_strrchr_c(arg, '>');
      int old_overrides = cmd->override;
      char *old_path = cmd->path;
      proxy_dir_conf *conf;
      ap_conf_vector_t *new_dir_conf = ap_create_per_dir_config(cmd->pool);
      ap_regex_t *r = NULL;
      const command_rec *thiscmd = cmd->cmd;
      char *word, *val;
      proxy_balancer *balancer = NULL;
      proxy_worker *worker = NULL;
  
      const char *err = ap_check_cmd_context(cmd,
                                             NOT_IN_DIR_LOC_FILE|NOT_IN_LIMIT);
      proxy_server_conf *sconf =
      (proxy_server_conf *) ap_get_module_config(cmd->server->module_config, &proxy_module);
  
      if (err != NULL) {
          return err;
      }
  
      if (endp == NULL) {
          return apr_pstrcat(cmd->pool, cmd->cmd->name,
                             "> directive missing closing '>'", NULL);
      }
  
      arg=apr_pstrndup(cmd->pool, arg, endp-arg);
  
      if (!arg) {
          if (thiscmd->cmd_data)
              return "<ProxyMatch > block must specify a path";
          else
              return "<Proxy > block must specify a path";
      }
  
      cmd->path = ap_getword_conf(cmd->pool, &arg);
      cmd->override = OR_ALL|ACCESS_CONF;
  
      if (!strncasecmp(cmd->path, "proxy:", 6))
          cmd->path += 6;
  
      /* XXX Ignore case?  What if we proxy a case-insensitive server?!?
       * While we are at it, shouldn't we also canonicalize the entire
       * scheme?  See proxy_fixup()
       */
      if (thiscmd->cmd_data) { /* <ProxyMatch> */
          r = ap_pregcomp(cmd->pool, cmd->path, AP_REG_EXTENDED);
          if (!r) {
              return "Regex could not be compiled";
          }
      }
      else if (!strcmp(cmd->path, "~")) {
          cmd->path = ap_getword_conf(cmd->pool, &arg);
          if (!cmd->path)
              return "<Proxy ~ > block must specify a path";
          if (strncasecmp(cmd->path, "proxy:", 6))
              cmd->path += 6;
          r = ap_pregcomp(cmd->pool, cmd->path, AP_REG_EXTENDED);
          if (!r) {
              return "Regex could not be compiled";
          }
      }
  
      /* initialize our config and fetch it */
      conf = ap_set_config_vectors(cmd->server, new_dir_conf, cmd->path,
                                   &proxy_module, cmd->pool);
  
      errmsg = ap_walk_config(cmd->directive->first_child, cmd, new_dir_conf);
      if (errmsg != NULL)
          return errmsg;
  
      conf->r = r;
      conf->p = cmd->path;
      conf->p_is_fnmatch = apr_fnmatch_test(conf->p);
  
      ap_add_per_proxy_conf(cmd->server, new_dir_conf);
  
      if (*arg != '\0') {
          if (thiscmd->cmd_data)
              return "Multiple <ProxyMatch> arguments not (yet) supported.";
          if (conf->p_is_fnmatch)
              return apr_pstrcat(cmd->pool, thiscmd->name,
                                 "> arguments are not supported for wildchar url.",
                                 NULL);
          if (!ap_strchr_c(conf->p, ':'))
              return apr_pstrcat(cmd->pool, thiscmd->name,
                                 "> arguments are not supported for non url.",
                                 NULL);
          if (strncasecmp(conf->p, "balancer:", 9) == 0) {
              balancer = ap_proxy_get_balancer(cmd->pool, sconf, conf->p);
              if (!balancer) {
                  err = ap_proxy_add_balancer(&balancer,
                                              cmd->pool,
                                              sconf, conf->p);
                  if (err)
                      return apr_pstrcat(cmd->temp_pool, thiscmd->name,
                                         " ", err, NULL);
              }
          }
          else {
              worker = ap_proxy_get_worker(cmd->temp_pool, sconf,
                                           conf->p);
              if (!worker) {
                  err = ap_proxy_add_worker(&worker, cmd->pool,
                                            sconf, conf->p);
                  if (err)
                      return apr_pstrcat(cmd->temp_pool, thiscmd->name,
                                         " ", err, NULL);
              }
          }
          if (worker == NULL && balancer == NULL) {
              return apr_pstrcat(cmd->pool, thiscmd->name,
                                 "> arguments are supported only for workers.",
                                 NULL);
          }
          while (*arg) {
              word = ap_getword_conf(cmd->pool, &arg);
              val = strchr(word, '=');
              if (!val) {
                  return "Invalid Proxy parameter. Parameter must be "
                         "in the form 'key=value'";
              }
              else
                  *val++ = '\0';
              if (worker)
                  err = set_worker_param(cmd->pool, worker, word, val);
              else
                  err = set_balancer_param(sconf, cmd->pool, balancer,
                                           word, val);
              if (err)
                  return apr_pstrcat(cmd->temp_pool, thiscmd->name, " ", err, " ",
                                     word, "=", val, "; ", conf->p, NULL);
          }
      }
  
      cmd->path = old_path;
      cmd->override = old_overrides;
  
      return NULL;
  }
  
  static const command_rec proxy_cmds[] =
  {
      AP_INIT_RAW_ARGS("<Proxy", proxysection, NULL, RSRC_CONF,
      "Container for directives affecting resources located in the proxied "
      "location"),
      AP_INIT_RAW_ARGS("<ProxyMatch", proxysection, (void*)1, RSRC_CONF,
      "Container for directives affecting resources located in the proxied "
      "location, in regular expression syntax"),
      AP_INIT_FLAG("ProxyRequests", set_proxy_req, NULL, RSRC_CONF,
       "on if the true proxy requests should be accepted"),
      AP_INIT_TAKE2("ProxyRemote", add_proxy_noregex, NULL, RSRC_CONF,
       "a scheme, partial URL or '*' and a proxy server"),
      AP_INIT_TAKE2("ProxyRemoteMatch", add_proxy_regex, NULL, RSRC_CONF,
       "a regex pattern and a proxy server"),
      AP_INIT_FLAG("ProxyPassInterpolateEnv", cmd_ProxyPassInterpolateEnv,
          (void*)APR_OFFSETOF(proxy_dir_conf, interpolate_env),
          RSRC_CONF|ACCESS_CONF, "Interpolate Env Vars in reverse Proxy") ,
      AP_INIT_RAW_ARGS("ProxyPass", add_pass_noregex, NULL, RSRC_CONF|ACCESS_CONF,
       "a virtual path and a URL"),
      AP_INIT_RAW_ARGS("ProxyPassMatch", add_pass_regex, NULL, RSRC_CONF|ACCESS_CONF,
       "a virtual path and a URL"),
      AP_INIT_TAKE123("ProxyPassReverse", add_pass_reverse, NULL, RSRC_CONF|ACCESS_CONF,
       "a virtual path and a URL for reverse proxy behaviour"),
      AP_INIT_TAKE23("ProxyPassReverseCookiePath", cookie_path, NULL,
         RSRC_CONF|ACCESS_CONF, "Path rewrite rule for proxying cookies"),
      AP_INIT_TAKE23("ProxyPassReverseCookieDomain", cookie_domain, NULL,
         RSRC_CONF|ACCESS_CONF, "Domain rewrite rule for proxying cookies"),
      AP_INIT_ITERATE("ProxyBlock", set_proxy_exclude, NULL, RSRC_CONF,
       "A list of names, hosts or domains to which the proxy will not connect"),
      AP_INIT_TAKE1("ProxyReceiveBufferSize", set_recv_buffer_size, NULL, RSRC_CONF,
       "Receive buffer size for outgoing HTTP and FTP connections in bytes"),
      AP_INIT_TAKE1("ProxyIOBufferSize", set_io_buffer_size, NULL, RSRC_CONF,
       "IO buffer size for outgoing HTTP and FTP connections in bytes"),
      AP_INIT_TAKE1("ProxyMaxForwards", set_max_forwards, NULL, RSRC_CONF,
       "The maximum number of proxies a request may be forwarded through."),
      AP_INIT_ITERATE("NoProxy", set_proxy_dirconn, NULL, RSRC_CONF,
       "A list of domains, hosts, or subnets to which the proxy will connect directly"),
      AP_INIT_TAKE1("ProxyDomain", set_proxy_domain, NULL, RSRC_CONF,
       "The default intranet domain name (in absence of a domain in the URL)"),
      AP_INIT_ITERATE("AllowCONNECT", set_allowed_ports, NULL, RSRC_CONF,
       "A list of ports which CONNECT may connect to"),
      AP_INIT_TAKE1("ProxyVia", set_via_opt, NULL, RSRC_CONF,
       "Configure Via: proxy header header to one of: on | off | block | full"),
      AP_INIT_FLAG("ProxyErrorOverride", set_proxy_error_override, NULL, RSRC_CONF,
       "use our error handling pages instead of the servers' we are proxying"),
      AP_INIT_FLAG("ProxyPreserveHost", set_preserve_host, NULL, RSRC_CONF,
       "on if we should preserve host header while proxying"),
      AP_INIT_TAKE1("ProxyTimeout", set_proxy_timeout, NULL, RSRC_CONF,
       "Set the timeout (in seconds) for a proxied connection. "
       "This overrides the server timeout"),
      AP_INIT_TAKE1("ProxyBadHeader", set_bad_opt, NULL, RSRC_CONF,
       "How to handle bad header line in response: IsError | Ignore | StartBody"),
      AP_INIT_RAW_ARGS("BalancerMember", add_member, NULL, RSRC_CONF|ACCESS_CONF,
       "A balancer name and scheme with list of params"),
      AP_INIT_TAKE1("ProxyStatus", set_status_opt, NULL, RSRC_CONF,
       "Configure Status: proxy status to one of: on | off | full"),
      AP_INIT_RAW_ARGS("ProxySet", set_proxy_param, NULL, RSRC_CONF|ACCESS_CONF,
       "A balancer or worker name with list of params"),
      AP_INIT_TAKE1("ProxyFtpDirCharset", set_ftp_directory_charset, NULL,
       RSRC_CONF|ACCESS_CONF, "Define the character set for proxied FTP listings"),
      {NULL}
  };
  
  static APR_OPTIONAL_FN_TYPE(ssl_proxy_enable) *proxy_ssl_enable = NULL;
  static APR_OPTIONAL_FN_TYPE(ssl_engine_disable) *proxy_ssl_disable = NULL;
  static APR_OPTIONAL_FN_TYPE(ssl_is_https) *proxy_is_https = NULL;
  static APR_OPTIONAL_FN_TYPE(ssl_var_lookup) *proxy_ssl_val = NULL;
  
  PROXY_DECLARE(int) ap_proxy_ssl_enable(conn_rec *c)
  {
      /*
       * if c == NULL just check if the optional function was imported
       * else run the optional function so ssl filters are inserted
       */
      if (proxy_ssl_enable) {
          return c ? proxy_ssl_enable(c) : 1;
      }
  
      return 0;
  }
  
  PROXY_DECLARE(int) ap_proxy_ssl_disable(conn_rec *c)
  {
      if (proxy_ssl_disable) {
          return proxy_ssl_disable(c);
      }
  
      return 0;
  }
  
  PROXY_DECLARE(int) ap_proxy_conn_is_https(conn_rec *c)
  {
      if (proxy_is_https) {
          return proxy_is_https(c);
      }
      else
          return 0;
  }
  
  PROXY_DECLARE(const char *) ap_proxy_ssl_val(apr_pool_t *p, server_rec *s,
                                               conn_rec *c, request_rec *r,
                                               const char *var)
  {
      if (proxy_ssl_val) {
          /* XXX Perhaps the casting useless */
          return (const char *)proxy_ssl_val(p, s, c, r, (char *)var);
      }
      else
          return NULL;
  }
  
  static int proxy_post_config(apr_pool_t *pconf, apr_pool_t *plog,
                               apr_pool_t *ptemp, server_rec *s)
  {
  
      proxy_ssl_enable = APR_RETRIEVE_OPTIONAL_FN(ssl_proxy_enable);
      proxy_ssl_disable = APR_RETRIEVE_OPTIONAL_FN(ssl_engine_disable);
      proxy_is_https = APR_RETRIEVE_OPTIONAL_FN(ssl_is_https);
      proxy_ssl_val = APR_RETRIEVE_OPTIONAL_FN(ssl_var_lookup);
  
      return OK;
  }
  
  
  #ifndef APACHE2NGINX
  /*
   *  proxy Extension to mod_status
   */
  static int proxy_status_hook(request_rec *r, int flags)
  {
      int i, n;
      void *sconf = r->server->module_config;
      proxy_server_conf *conf = (proxy_server_conf *)
          ap_get_module_config(sconf, &proxy_module);
      proxy_balancer *balancer = NULL;
      proxy_worker *worker = NULL;
  
      if (flags & AP_STATUS_SHORT || conf->balancers->nelts == 0 ||
          conf->proxy_status == status_off)
          return OK;
  
      balancer = (proxy_balancer *)conf->balancers->elts;
      for (i = 0; i < conf->balancers->nelts; i++) {
          ap_rputs("<hr />\n<h1>Proxy LoadBalancer Status for ", r);
          ap_rvputs(r, balancer->name, "</h1>\n\n", NULL);
          ap_rputs("\n\n<table border=\"0\"><tr>"
                   "<th>SSes</th><th>Timeout</th><th>Method</th>"
                   "</tr>\n<tr>", r);
          if (balancer->sticky) {
              ap_rvputs(r, "<td>", balancer->sticky, NULL);
          }
          else {
              ap_rputs("<td> - ", r);
          }
          ap_rprintf(r, "</td><td>%" APR_TIME_T_FMT "</td>",
                     apr_time_sec(balancer->timeout));
          ap_rprintf(r, "<td>%s</td>\n",
                     balancer->lbmethod->name);
          ap_rputs("</table>\n", r);
          ap_rputs("\n\n<table border=\"0\"><tr>"
                   "<th>Sch</th><th>Host</th><th>Stat</th>"
                   "<th>Route</th><th>Redir</th>"
                   "<th>F</th><th>Set</th><th>Acc</th><th>Wr</th><th>Rd</th>"
                   "</tr>\n", r);
  
          worker = (proxy_worker *)balancer->workers->elts;
          for (n = 0; n < balancer->workers->nelts; n++) {
              char fbuf[50];
              ap_rvputs(r, "<tr>\n<td>", worker->scheme, "</td>", NULL);
              ap_rvputs(r, "<td>", worker->hostname, "</td><td>", NULL);
              if (worker->s->status & PROXY_WORKER_DISABLED)
                  ap_rputs("Dis", r);
              else if (worker->s->status & PROXY_WORKER_IN_ERROR)
                  ap_rputs("Err", r);
              else if (worker->s->status & PROXY_WORKER_INITIALIZED)
                  ap_rputs("Ok", r);
              else
                  ap_rputs("-", r);
              ap_rvputs(r, "</td><td>", worker->s->route, NULL);
              ap_rvputs(r, "</td><td>", worker->s->redirect, NULL);
              ap_rprintf(r, "</td><td>%d</td>", worker->s->lbfactor);
              ap_rprintf(r, "<td>%d</td>", worker->s->lbset);
              ap_rprintf(r, "<td>%" APR_SIZE_T_FMT "</td><td>", worker->s->elected);
              ap_rputs(apr_strfsize(worker->s->transferred, fbuf), r);
              ap_rputs("</td><td>", r);
              ap_rputs(apr_strfsize(worker->s->read, fbuf), r);
              ap_rputs("</td>\n", r);
  
              /* TODO: Add the rest of dynamic worker data */
              ap_rputs("</tr>\n", r);
  
              ++worker;
          }
          ap_rputs("</table>\n", r);
          ++balancer;
      }
      ap_rputs("<hr /><table>\n"
               "<tr><th>SSes</th><td>Sticky session name</td></tr>\n"
               "<tr><th>Timeout</th><td>Balancer Timeout</td></tr>\n"
               "<tr><th>Sch</th><td>Connection scheme</td></tr>\n"
               "<tr><th>Host</th><td>Backend Hostname</td></tr>\n"
               "<tr><th>Stat</th><td>Worker status</td></tr>\n"
               "<tr><th>Route</th><td>Session Route</td></tr>\n"
               "<tr><th>Redir</th><td>Session Route Redirection</td></tr>\n"
               "<tr><th>F</th><td>Load Balancer Factor in %</td></tr>\n"
               "<tr><th>Acc</th><td>Number of requests</td></tr>\n"
               "<tr><th>Wr</th><td>Number of bytes transferred</td></tr>\n"
               "<tr><th>Rd</th><td>Number of bytes read</td></tr>\n"
               "</table>", r);
  
      return OK;
  }
  
  
  static void child_init(apr_pool_t *p, server_rec *s)
  {
      proxy_worker *reverse = NULL;
  
      while (s) {
          void *sconf = s->module_config;
          proxy_server_conf *conf;
          proxy_worker *worker;
          int i;
  
          conf = (proxy_server_conf *)ap_get_module_config(sconf, &proxy_module);
          /* Initialize worker's shared scoreboard data */
          worker = (proxy_worker *)conf->workers->elts;
          for (i = 0; i < conf->workers->nelts; i++) {
              ap_proxy_initialize_worker_share(conf, worker, s);
              ap_proxy_initialize_worker(worker, s);
              worker++;
          }
          /* Initialize forward worker if defined */
          if (conf->forward) {
              ap_proxy_initialize_worker_share(conf, conf->forward, s);
              ap_proxy_initialize_worker(conf->forward, s);
              /* Do not disable worker in case of errors */
              conf->forward->s->status |= PROXY_WORKER_IGNORE_ERRORS;
              /* Disable address cache for generic forward worker */
              conf->forward->is_address_reusable = 0;
          }
          if (!reverse) {
              reverse = ap_proxy_create_worker(p);
              reverse->name     = "proxy:reverse";
              reverse->hostname = "*";
              reverse->scheme   = "*";
              ap_proxy_initialize_worker_share(conf, reverse, s);
              ap_proxy_initialize_worker(reverse, s);
              /* Do not disable worker in case of errors */
              reverse->s->status |= PROXY_WORKER_IGNORE_ERRORS;
              /* Disable address cache for generic reverse worker */
              reverse->is_address_reusable = 0;
          }
          conf->reverse = reverse;
          s = s->next;
      }
  }
  #endif // APACHE2NGINX
  
  
  /*
   * This routine is called before the server processes the configuration
   * files.  There is no return value.
   */
  static int proxy_pre_config(apr_pool_t *pconf, apr_pool_t *plog,
                              apr_pool_t *ptemp)
  {
  #ifndef APACHE2NGINX
      APR_OPTIONAL_HOOK(ap, status_hook, proxy_status_hook, NULL, NULL,
                        APR_HOOK_MIDDLE);
  #endif
      /* Reset workers count on gracefull restart */
      proxy_lb_workers = 0;
      return OK;
  }
  
  static void register_hooks(apr_pool_t *p)
  {
      /* fixup before mod_rewrite, so that the proxied url will not
       * escaped accidentally by our fixup.
       */
      static const char * const aszSucc[]={ "mod_rewrite.c", NULL };
      /* Only the mpm_winnt has child init hook handler.
       * make sure that we are called after the mpm
       * initializes.
       */
      static const char *const aszPred[] = { "mpm_winnt.c", NULL};
  
      APR_REGISTER_OPTIONAL_FN(ap_proxy_lb_workers);
      /* handler */
  #ifndef APACHE2NGINX
      ap_hook_handler(proxy_handler, NULL, NULL, APR_HOOK_FIRST);
      /* filename-to-URI translation */
      ap_hook_translate_name(proxy_trans, aszSucc, NULL, APR_HOOK_FIRST);
      /* walk <Proxy > entries and suppress default TRACE behavior */
      ap_hook_map_to_storage(proxy_map_location, NULL,NULL, APR_HOOK_FIRST);
      /* fixups */
      ap_hook_fixups(proxy_fixup, NULL, aszSucc, APR_HOOK_FIRST);
      /* post read_request handling */
      ap_hook_post_read_request(proxy_detect, NULL, NULL, APR_HOOK_FIRST);
  #endif
      /* pre config handling */
      ap_hook_pre_config(proxy_pre_config, NULL, NULL, APR_HOOK_MIDDLE);
      /* post config handling */
      ap_hook_post_config(proxy_post_config, NULL, NULL, APR_HOOK_MIDDLE);
  #ifndef APACHE2NGINX
      /* child init handling */
      ap_hook_child_init(child_init, aszPred, NULL, APR_HOOK_MIDDLE);
  #endif
  
  }
  
  
  struct upstream_rec_element {
      char *old_upstream_name;
      char *upstream_name;
      int num;
      proxy_server_conf *belong_server;
  };
  
  /* record the upstream name. */
  static apr_array_header_t *upstream_rec_list = NULL;
  
  /** 
   * @brief The below codes convert mod_proxy to Ngx configurations.
   * 
   * @param pool
   * @param parms
   * @param v
   * 
   * @return 
   */
  
  static void *
  convert_proxy_dir(apr_pool_t *pool, cmd_parms *parms, ap_conf_vector_t* v)
  {
      apn_module_t *mod = NULL;
      int i;
  
      server_rec *s = parms->server;
      proxy_server_conf *conf =
              ap_get_module_config(s->module_config, &proxy_module);
  
      /* list the proxy_pass in dir */
      if (parms->path != NULL && conf != NULL) {
          struct proxy_alias *new;
          new = (struct proxy_alias *)conf->aliases->elts;
  
          for (i = 0; i < conf->aliases->nelts; i++) {
              if (new->is_in_dir == 1 && strcmp(new->fake, parms->path) == 0) {
                  //printf("real:%s  fake:%s \n", new->real, new->fake);
                  mod = apn_mod_insert_sibling(mod, "proxy_pass", new->real);
              }
  
              new++;
          }
      }
  
      proxy_dir_conf *dconf = (proxy_dir_conf *)ap_get_module_config(v, &proxy_module);
      if (dconf == NULL) {
          return mod;
      }
  
      struct proxy_alias *ralias;
      ralias = (struct proxy_alias *)dconf->raliases->elts;
      for (i = 0; i < dconf->raliases->nelts; i++) {
          if (ralias->fake != NULL && ralias->real != NULL) {
              char *args = apr_pstrcat(pool, ralias->fake, " ", ralias->real, NULL);
              mod = apn_mod_insert_sibling(mod, "proxy_redirect", args);
          }
  
          ralias++;
      }
  
      return mod;
  }
  
  
  static void *
  convert_proxy_server(apr_pool_t *pool, cmd_parms *parms, ap_conf_vector_t* v)
  {
      apn_module_t *mod = NULL;
      int i;
      int j;
  
      proxy_server_conf *conf =
          (proxy_server_conf *) ap_get_module_config(v, &proxy_module);
  
  
      proxy_worker *worker;
      worker = (proxy_worker *)conf->workers->elts;
      for (i = 0; i < conf->workers->nelts; i++) {
          //printf("worker: %s %s %s %s \n", worker->name, worker->scheme, worker->hostname, worker->route);
          worker++;
      }
  
      /** get balancer */
      proxy_balancer *balancer;
      balancer = (proxy_balancer *)conf->balancers->elts;
      for (i = 0; i < conf->balancers->nelts; i++) {
          printf("name of balancer: %s \n", balancer->name);
  
          apn_node_t *new_node = NULL;
  
          char *upstream_name = NULL;
          char *old_upstream_name = NULL;
          char *upstream_args = NULL;
          old_upstream_name = apr_pstrcat(pool, balancer->name + strlen("balancer://"), NULL);
          upstream_name = old_upstream_name;
  
  
          /* manage the upstream recs */
          /* create list */
          if (upstream_rec_list == NULL) {
              upstream_rec_list = apr_array_make(pool, 2, sizeof(struct upstream_rec_element));
          }
  
          /* tranverse the list, get the new availble upstream_name */
          struct upstream_rec_element *ups;
          ups = (struct upstream_rec_element *)upstream_rec_list->elts;
          int i = 0;
          int duplicate = 0; // not duplicate.
          for (i = 0; i < upstream_rec_list->nelts; i++) {
              if (upstream_name != NULL && strcmp(ups->upstream_name, upstream_name) == 0) {
                  //upstream_name = apr_pstrcat(pool, upstream_name, apr_itoa(pool, ups->num + 1), NULL);
                  duplicate = 1;
                  ups->num ++;
                  break;
              }
              ups++;
          }
  
          /* add the new upstream_rec_elsment into upstream_rec_list */
          struct upstream_rec_element *new = NULL;
          if (duplicate == 0) {
              new = (struct upstream_rec_element *)apr_array_push(upstream_rec_list);
              new->old_upstream_name = old_upstream_name;
              new->upstream_name = upstream_name;
              new->num = 0;
              new->belong_server = conf;
          }
  
  
          upstream_args = apr_pstrcat(pool, upstream_name, " {", NULL);
  
          new_node = apn_new_node("upstream", upstream_args);
          /* upstream block should befor all the server blocks */
          new_node->need_fixup = 1;
          new_node->comment = "This upstream name is duplicate with another one. Please check.";
  
          apn_module_t *temp_mod = NULL;
  
          char *maxattempts;
          if (balancer->max_attempts_set == 1) {
              maxattempts = apr_itoa(pool, balancer->max_attempts);
              maxattempts = apr_pstrcat(pool, " max_fails=", maxattempts, NULL);
          } else {
              maxattempts = "";
          }
          
          proxy_worker *worker2;
          worker2 = (proxy_worker *)balancer->workers->elts;
          for (j = 0; j < balancer->workers->nelts; j++) {
              //printf("worker2: %s %s %s %s \n", worker2->name, worker2->scheme, worker2->hostname, worker2->route);
              char *port = apr_itoa(pool, worker2->port);
              char *hostname;
              if (strcmp(worker2->hostname, "localhost") == 0) {
                  hostname = "127.0.0.1";
              } else {
                  hostname = worker2->hostname;
              }
              
              char *lbfactor;
              char *timeout;
              char *args;
  
              if (worker2->lbfactor > 0) {
                  lbfactor = apr_itoa(pool, worker2->lbfactor);
                  lbfactor = apr_pstrcat(pool, " weight=", lbfactor, NULL);
              } else {
                  lbfactor = "";
              }
  
              if (worker2->timeout_set == 1) {
                  timeout = apr_itoa(pool, worker2->timeout / APR_USEC_PER_SEC);
                  timeout = apr_pstrcat(pool, " fail_timeout=", timeout, "s", NULL);
              } else {
                  timeout = "";
              }
  
              args = apr_pstrcat(pool, hostname, ":", port, lbfactor, maxattempts, timeout, NULL);
              
              
              temp_mod = apn_mod_insert_sibling(temp_mod, "server", args);
  
              worker2++;
          }
  
          if (temp_mod != NULL) {
              new_node = apn_insert_subtree(new_node, temp_mod->directives);
              if (mod == NULL) {
                  mod = apn_new_module(new_node);
              } else {
                  mod->directives = apn_cat_node(mod->directives, new_node);
              }
          }
  
          balancer++; 
      }
  
      /* list the alias */
      struct proxy_alias *new;
      new = (struct proxy_alias *)conf->aliases->elts;
  
      for (i = 0; i < conf->aliases->nelts; i++) {
          //printf("real:%s %s \n", new->real, new->fake); 
          char *real;
          char *loc_args = NULL;
          if (new->real != NULL && strncmp(new->real, "balancer://", strlen("balancer://")) == 0) {
              real = apr_pstrcat(pool,"http://", new->real + strlen("balancer://"), NULL);
          } else {
              real = new->real;
          }
  
          /* don't convert the proxy_pass in dir. */
          if (new->is_in_dir == 0) {
              if (new->regex != NULL) {
                  loc_args = apr_pstrcat(pool, "~ ", new->fake, " {", NULL);
                  mod = apn_mod_insert_sibling(mod, "location", loc_args);
              } else {
                  loc_args = apr_pstrcat(pool, new->fake, " {", NULL);
                  mod = apn_mod_insert_sibling(mod, "location", loc_args);
              }
              mod = apn_mod_insert_child(mod, "proxy_pass", real);
          }
  
          new++;
      }
  
  
      /* buffer size */
      if (conf->recv_buffer_size_set == 1) {
          mod = apn_mod_insert_sibling(mod, "proxy_buffering", "on");
          char *buffer_size = apr_itoa(pool, conf->recv_buffer_size);
          mod = apn_mod_insert_sibling(mod, "proxy_buffer_size", buffer_size);
      }
  
      /* proxy error override */
      if (conf->error_override_set == 1 ) {
          if (conf->error_override == 1) {
              mod = apn_mod_insert_sibling(mod, "proxy_intercept_errors", "on");
          }
      }
  
      /* proxy timeout */
      if (conf->timeout_set == 1) {
          char *timeout = 
              apr_itoa(pool, conf->timeout / APR_USEC_PER_SEC ); /* chage microseconds to seconds. */
  
          mod = apn_mod_insert_sibling(mod, "proxy_connect_timeout", timeout);
          mod = apn_mod_insert_sibling(mod, "proxy_read_timeout", timeout);
          mod = apn_mod_insert_sibling(mod, "proxy_send_timeout", timeout);
      }
  
      /* preserve host */
      if (conf->preserve_host_set == 1) {
          if (conf->preserve_host == 1) {
              mod = apn_mod_insert_sibling(mod, "proxy_set_header", "Host $http_host");
          }
      }
  
  
      return mod;
  }
  
  
  module AP_MODULE_DECLARE_DATA proxy_module =
  {
      STANDARD20_MODULE_STUFF,
      create_proxy_dir_config,    /* create per-directory config structure */
      merge_proxy_dir_config,     /* merge per-directory config structures */
      create_proxy_config,        /* create per-server config structure */
      merge_proxy_config,         /* merge per-server config structures */
      proxy_cmds,                 /* command table */
      register_hooks,
  
      convert_proxy_dir,          /* convert per dir config of Proxy */
      convert_proxy_server        /* convert per server config of Proxy */
  };
  
  APR_HOOK_STRUCT(
      APR_HOOK_LINK(scheme_handler)
      APR_HOOK_LINK(canon_handler)
      APR_HOOK_LINK(pre_request)
      APR_HOOK_LINK(post_request)
      APR_HOOK_LINK(request_status)
  )
  
  APR_IMPLEMENT_EXTERNAL_HOOK_RUN_FIRST(proxy, PROXY, int, scheme_handler,
                                       (request_rec *r, proxy_worker *worker,
                                        proxy_server_conf *conf,
                                        char *url, const char *proxyhost,
                                        apr_port_t proxyport),(r,worker,conf,
                                        url,proxyhost,proxyport),DECLINED)
  APR_IMPLEMENT_EXTERNAL_HOOK_RUN_FIRST(proxy, PROXY, int, canon_handler,
                                        (request_rec *r, char *url),(r,
                                        url),DECLINED)
  APR_IMPLEMENT_EXTERNAL_HOOK_RUN_FIRST(proxy, PROXY, int, pre_request, (
                                        proxy_worker **worker,
                                        proxy_balancer **balancer,
                                        request_rec *r,
                                        proxy_server_conf *conf,
                                        char **url),(worker,balancer,
                                        r,conf,url),DECLINED)
  APR_IMPLEMENT_EXTERNAL_HOOK_RUN_FIRST(proxy, PROXY, int, post_request,
                                        (proxy_worker *worker,
                                         proxy_balancer *balancer,
                                         request_rec *r,
                                         proxy_server_conf *conf),(worker,
                                         balancer,r,conf),DECLINED)
  APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(proxy, PROXY, int, fixups,
                                      (request_rec *r), (r),
                                      OK, DECLINED)
  APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(proxy, PROXY, int, request_status,
                                      (int *status, request_rec *r),
                                      (status, r),
                                      OK, DECLINED)
  