Proxies
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... prefix values (see section 3.1). Unrecognized decl-ext
parameters SHOULD be ignored and MUST NOT be removed by proxies when
forwarding the extension declaration.
...
... Man, Opt, C-Man, and C-Opt. (See sections 4.1 and 4.2; also see
appendix 14, which has a table of interactions with origin servers
and proxies.)
The header fields ...
... The following tables summarize the outcome of strength and scope rules
of the mandatory proposal of compliant and non-compliant HTTP proxies
and origin servers. The summary is intended as a guide and index to
the text, but is necessarily cryptic and incomplete. This summary
...