A mandatory extension declaration indicates that the ultimate recipient MUST consult and adhere to the rules given by the extension when processing the message or reporting an error. Hop-by-hop extension declarations are meaningful only for a single HTTP connection. In HTTP/1.1, C-Man, C-Opt, and all header fields with matching header-prefix values defined by C-Man and C-Opt MUST be protected by a Connection header field. That is, these header fields are to be included as Connection header field directives. (RFC 2774: An HTTP Extension Framework)


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