1.4 Relationship to Other Protocols
This protocol requires the Hypertext Transfer Protocol 1.0 (HTTP/1.0), as described in [RFC1945], or the Hypertext Transfer Protocol 1.1 (HTTP/1.1), as described in [RFC2616], protocol for message transport. It transmits those messages by using HTTP, as described in [RFC2616], or Hypertext Transfer Protocol over Secure Sockets Layer (HTTPS), as described in [RFC2818].
The following diagram shows the underlying messaging and transport stack used by the protocol:
Figure 1: This protocol in relation to other protocols