Exchanging supplemental information fields between a client and a server

摘要

A method for exchanging one or more supplemental fields between a client and a server comprises receiving a client request 405 for a URL, and determining whether the server can complete the request 410. If the server cannot complete the request but another server can, a Redirect message 435 is returned to the client specifying a different URL associated with a different server. A supplemental information request 437 is sent to the client if any of the supplemental information fields are required before completing the client request. If a predetermined number of events to obtain the supplemental field are unsuccessful, or if no server can complete the request, an error message 425 is returned to the client.