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= ROOT|Technical|RFC|rfc3875.txt =

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   suffer limited portability.

   The server SHOULD set this meta-variable if the request URI includes
   a path-info component.  If PATH_INFO is NULL, then the
   PATH_TRANSLATED variable MUST be set to NULL (or unset).

4.1.7.  QUERY_STRING

   The QUERY_STRING variable contains a URL-encoded search or parameter
   string; it provides information to the CGI script to affect or refine
   the document to be returned by the script.

   The URL syntax for a search string is described in section 3 of RFC
   2396 [2].  The QUERY_STRING value is case-sensitive.

      QUERY_STRING = query-string
      query-string = *uric
      uric         = reserved | unreserved | escaped

   When parsing and decoding the query string, the details of the
   parsing, reserved characters and support for non US-ASCII characters
   depends on the context.  For example, form submission from an HTML
   document [18] uses application/x-www-form-urlencoded encoding, in
   which the characters "+", "&" and "=" are reserved, and the ISO
   8859-1 encoding may be used for non US-ASCII characters.

   The QUERY_STRING value provides the query-string part of the
   Script-URI.  (See section 3.3).

   The server MUST set this variable; if the Script-URI does not include
   a query component, the QUERY_STRING MUST be defined as an empty
   string ("").

4.1.8.  REMOTE_ADDR

   The REMOTE_ADDR variable MUST be set to the network address of the
   client sending the request to the server.





 
RFC 3875                    CGI Version 1.1                 October 2004


      REMOTE_ADDR  = hostnumber
      hostnumber   = ipv4-address | ipv6-address
      ipv4-address = 1*3digit "." 1*3digit "." 1*3digit "." 1*3digit
      ipv6-address = hexpart [ ":" ipv4-address ]
      hexpart      = hexseq | ( [ hexseq ] "::" [ hexseq ] )
      hexseq       = 1*4hex *( ":" 1*4hex )

   The format of an IPv6 address is described in RFC 3513 [15].

4.1.9.  REMOTE_HOST

   The REMOTE_HOST variable contains the fully qualified domain name of
   the client sending the request to the server, if available, otherwise
   NULL.  Fully qualified domain names take the form as described in
   section 3.5 of RFC 1034 [17] and section 2.1 of RFC 1123 [12].
   Domain names are not case sensitive.

      REMOTE_HOST   = "" | hostname | hostnumber
      hostname      = *( domainlabel "." ) toplabel [ "." ]
      domainlabel   = alphanum [ *alphahypdigit alphanum ]
      toplabel      = alpha [ *alphahypdigit alphanum ]
      alphahypdigit = alphanum | "-"

   The server SHOULD set this variable.  If the hostname is not
   available for performance reasons or otherwise, the server MAY
   substitute the REMOTE_ADDR value.

4.1.10.  REMOTE_IDENT

   The REMOTE_IDENT variable MAY be used to provide identity information
   reported about the connection by an RFC 1413 [20] request to the
   remote agent, if available.  The server may choose not to support
   this feature, or not to request the data for efficiency reasons, or
   not to return available identity data.

      REMOTE_IDENT = *TEXT

   The data returned may be used for authentication purposes, but the
   level of trust reposed in it should be minimal.

4.1.11.  REMOTE_USER

   The REMOTE_USER variable provides a user identification string
   supplied by client as part of user authentication.

      REMOTE_USER = *TEXT






 
RFC 3875                    CGI Version 1.1                 October 2004
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