The Expect request-header field is used to indicate that particular server behaviors are required by the client.

   Expect       =  "Expect" ":" 1#expectation

   expectation  =  "100-continue" | expectation-extension
   expectation-extension =  token [ "=" ( token | quoted-string )
                            *expect-params ]
   expect-params =  ";" token [ "=" ( token | quoted-string ) ]

A server that does not understand or is unable to comply with any of the expectation values in the Expect field of a request MUST respond with appropriate error status. The server MUST respond with a 417 (Expectation Failed) status if any of the expectations cannot be met or, if there are other problems with the request, some other 4xx status.

version: $ - Revision: 744532 $

since: 4.0 -

 public  void verify(HttpRequest request,
    HttpResponse response,
    HttpContext context) throws HttpException
Verifies whether the given request meets the server's expectations. 

If the request fails to meet particular criteria, this method can
trigger a terminal response back to the client by setting the status
code of the response object to a value greater or equal to 
200. In this case the client will not have to transmit 
the request body. If the request meets expectations this method can 
terminate without modifying the response object. Per default the status 
code of the response object will be set to 100.