2.2.5 wsignout1.0 Request Message
The wsignout1.0 request message is specified in [WSFederation1.2] section 13.2.4.1 and is a request to a requestor IP/STS to delete the cached session state for a specific user. The protocol does not specify a response and does not guarantee the operation will complete. The wsignout1.0 request message consists of an HTTP GET with the following query string parameters, as specified in [WSFederation1.2] section 13.2.4.1:
wa: The value MUST be the literal string "wsignout1.0".
wreply (optional): The value is a URL at the relying party to which the web browser requestor SHOULD<31> be redirected once sign-out processing is complete.