text: 
  namespace http {
  namespace header {
  //------------------------------------------------
  using Field = const char*;
  //------------------------------------------------
  // Request Fields
  //------------------------------------------------
  Field Accept              {"Accept"};
  Field Accept_Charset      {"Accept-Charset"};
  Field Accept_Encoding     {"Accept-Encoding"};
  Field Accept_Language     {"Accept-Language"};
  Field Authorization       {"Authorization"};
  Field Cookie              {"Cookie"};
  Field Connection          {"Connection"};
  Field Expect              {"Expect"};
  Field From                {"From"};
  Field Host                {"Host"};
  Field HTTP2_Settings      {"HTTP2-Settings"};
  Field If_Match            {"If-Match"};
  Field If_Modified_Since   {"If-Modified-Since"};
  Field If_None_Match       {"If-None-Match"};
  Field If_Range            {"If-Range"};
  Field If_Unmodified_Since {"If-Unmodified-Since"};
  Field Max_Forwards        {"Max-Forwards"};
  Field Origin              {"Origin"};
  Field Proxy_Authorization {"Proxy-Authorization"};
  Field Range               {"Range"};
  Field Referer             {"Referer"};
  Field TE                  {"TE"};
  Field Upgrade             {"Upgrade"};
  Field User_Agent          {"User-Agent"};
  //------------------------------------------------
  // Response Fields
  //------------------------------------------------
  Field Accept_Ranges       {"Accept-Ranges"};
  Field Age                 {"Age"};
  Field Date                {"Date"};
  Field ETag                {"ETag"};
  Field Location            {"Location"};
  Field Proxy_Authenticate  {"Proxy-Authenticate"};
  Field Retry_After         {"Retry-After"};
  Field Server              {"Server"};
  Field Set_Cookie          {"Set-Cookie"};
  Field Vary                {"Vary"};
  Field WWW_Authenticate    {"WWW-Authenticate"};
  //------------------------------------------------
  // Entity Fields
  //------------------------------------------------
  Field Allow               {"Allow"};
  Field Content_Encoding    {"Content-Encoding"};
  Field Content_Language    {"Content-Language"};
  Field Content_Length      {"Content-Length"};
  Field Content_Location    {"Content-Location"};
  Field Content_MD5         {"Content-MD5"};
  Field Content_Range       {"Content-Range"};
  Field Content_Type        {"Content-Type"};
  Field Expires             {"Expires"};
  Field Last_Modified       {"Last-Modified"};
  //------------------------------------------------
  //------------------------------------------------
  } //< namespace header
  } //< namespace http
  