1.7 Versioning and Capability Negotiation
Supported Transports: WebDAV Protocol: Server Extensions use HTTP as the only transport.
Capability Negotiation: Negotiation of WebDAV (as specified in [RFC4918] sections 10.1 and 18) and HTTP capabilities (as specified in [RFC2068] section 9.2) is via the OPTIONS method. This specification extends the OPTIONS method that uses an HTTP response header to indicate which authoring tools should be used. For more information about authoring, see section 2.2.2.