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= ROOT|Technical|RFC|rfc3875.txt =

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   being used by the server to communicate with the script.  Syntax:

      GATEWAY_INTERFACE = "CGI" "/" 1*digit "." 1*digit

   Note that the major and minor numbers are treated as separate
   integers and hence each may be incremented higher than a single
   digit.  Thus CGI/2.4 is a lower version than CGI/2.13 which in turn
   is lower than CGI/12.3.  Leading zeros MUST be ignored by the script
   and MUST NOT be generated by the server.

   This document defines the 1.1 version of the CGI interface.

4.1.5.  PATH_INFO

   The PATH_INFO variable specifies a path to be interpreted by the CGI
   script.  It identifies the resource or sub-resource to be returned by
   the CGI script, and is derived from the portion of the URI path
   hierarchy following the part that identifies the script itself.
   Unlike a URI path, the PATH_INFO is not URL-encoded, and cannot
   contain path-segment parameters.  A PATH_INFO of "/" represents a
   single void path segment.

      PATH_INFO = "" | ( "/" path )
      path      = lsegment *( "/" lsegment )
      lsegment  = *lchar
      lchar     = <any TEXT or CTL except "/">

RFC 3875                    CGI Version 1.1                 October 2004

   The value is considered case-sensitive and the server MUST preserve
   the case of the path as presented in the request URI.  The server MAY
   impose restrictions and limitations on what values it permits for
   PATH_INFO, and MAY reject the request with an error if it encounters
   any values considered objectionable.  That MAY include any requests
   that would result in an encoded "/" being decoded into PATH_INFO, as
   this might represent a loss of information to the script.  Similarly,
   treatment of non US-ASCII characters in the path is system-defined.

   URL-encoded, the PATH_INFO string forms the extra-path component of
   the Script-URI (see section 3.3) which follows the SCRIPT_NAME part
   of that path.


   The PATH_TRANSLATED variable is derived by taking the PATH_INFO
   value, parsing it as a local URI in its own right, and performing any
   virtual-to-physical translation appropriate to map it onto the
   server's document repository structure.  The set of characters
   permitted in the result is system-defined.

      PATH_TRANSLATED = *<any character>

   This is the file location that would be accessed by a request for

       "://" <server-name> ":" <server-port> 

   where  is the scheme for the original client request and
    is a URL-encoded version of PATH_INFO, with ";", "=" and
   "?"  reserved.  For example, a request such as the following:

   would result in a PATH_INFO value of


   An internal URI is constructed from the scheme, server location and
   the URL-encoded PATH_INFO:

   This would then be translated to a location in the server's document
   repository, perhaps a filesystem path something like this:


   The value of PATH_TRANSLATED is the result of the translation.

RFC 3875                    CGI Version 1.1                 October 2004

   The value is derived in this way irrespective of whether it maps to a
   valid repository location.  The server MUST preserve the case of the
   extra-path segment unless the underlying repository supports case-
   insensitive names.  If the repository is only case-aware, case-
   preserving, or case-blind with regard to document names, the server
   is not required to preserve the case of the original segment through
   the translation.

   The translation algorithm the server uses to derive PATH_TRANSLATED
   is implementation-defined; CGI scripts which use this variable may

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