3.2.5.3.4 Message Transmission

The requestor IP/STS SHOULD send a wsignoutcleanup1.0 request message to each relying party using an explicit HTTP GET method because the protocol does not support chaining wsignoutcleanup1.0 messages using the HTTP 1.1 redirection facilities. How these messages are sent is implementation-specific and not addressed in this protocol. The requestor IP/STS MAY walk the list of relying parties and issue the requests individually.<65>