The Method token indicates the method to be performed on the resource
   identified by the Request-URI. The method is case-sensitive.

       Method         = "GET"                    ; Section 8.1
                      | "HEAD"                   ; Section 8.2
                      | "POST"                   ; Section 8.3
                      | extension-method

       extension-method = token

   The list of methods acceptable by a specific resource can change
   dynamically; the client is notified through the return code of the
   response if a method is not allowed on a resource. Servers should
   return the status code 501 (not implemented) if the method is
   unrecognized or not implemented.

   The methods commonly used by HTTP/1.0 applications are fully defined
   in Section 8.

5.1.2 Request-URI

   The Request-URI is a Uniform Resource Identifier (Section 3.2) and
   identifies the resource upon which to apply the request.

       Request-URI    = absoluteURI | abs_path

   The two options for Request-URI are dependent on the nature of the
   request.

   The absoluteURI form is only allowed when the request is being made
   to a proxy. The proxy is requested to forward the request and return
   the response. If the request is GET or HEAD and a prior response is
   cached, the proxy may use the cached message if it passes any
   restrictions in the Expires header field. Note that the proxy may
   forward the request on to another proxy or directly to the server
   specified by the absoluteURI. In order to avoid request loops, a
   proxy must be able to recognize all of its server names, including
   any aliases, local variations, and the numeric IP address. An example
   Request-Line would be:

       GET http://www.w3.org/pub/WWW/TheProject.html HTTP/1.0





 
RFC 1945                        HTTP/1.0                        May 1996


   The most common form of Request-URI is that used to identify a
   resource on an origin server or gateway. In this case, only the
   absolute path of the URI is transmitted (see Section 3.2.1,
   abs_path). For example, a client wishing to retrieve the resource
   above directly from the origin server would create a TCP connection
   to port 80 of the host "www.w3.org" and send the line:

       GET /pub/WWW/TheProject.html HTTP/1.0

   followed by the remainder of the Full-Request. Note that the absolute
   path cannot be empty; if none is present in the original URI, it must
   be given as "/" (the server root).

   The Request-URI is transmitted as an encoded string, where some
   characters may be escaped using the "% HEX HEX" encoding defined by
   RFC 1738 [4]. The origin server must decode the Request-URI in order
   to properly interpret the request.

5.2  Request Header Fields

   The request header fields allow the client to pass additional
   information about the request, and about the client itself, to the
   server. These fields act as request modifiers, with semantics
   equivalent to the parameters on a programming language method
   (procedure) invocation.

       Request-Header = Authorization            ; Section 10.2
                      | From                     ; Section 10.8
                      | If-Modified-Since        ; Section 10.9
                      | Referer                  ; Section 10.13
                      | User-Agent               ; Section 10.15

   Request-Header field names can be extended reliably only in
   combination with a change in the protocol version. However, new or
   experimental header fields may be given the semantics of request
   header fields if all parties in the communication recognize them to
   be request header fields. Unrecognized header fields are treated as
   Entity-Header fields.

6.  Response

   After receiving and interpreting a request message, a server responds
   in the form of an HTTP response message.

       Response        = Simple-Response | Full-Response

       Simple-Response = [ Entity-Body ]