2.2.6.10.2 com.microsoft.wm.fastcache

The com.microsoft.wm.fastcache token specifies that the server permits the use of the Speed header, as specified in [RFC2326] section 12.35.

This token is defined for use only in responses sent to a client.

If a server never sends the Supported header, clients MUST NOT include the Speed header in RTSP requests sent to the server.<12>