ation. A
        server SHOULD provide a means (through a configuration file, for example) for a
        service to indicate which of its procedures are safe and idempotent in order to
        be callable using HTTP GET. In the absence of such means on the other hand, the
        server MUST allow invocations using HTTP POST only.</p>
    <p>
        A server MUST respond with an error if a client attempts to invoke a procedure that
        has not been designated by the service as safe for call using HTTP 