http: minimum content-encoding support for clients?

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Is there a minimum set of content-encodings that a http client must support?

Restated: Is a client that only implements content-encoding:identity conformant with standards?

I can't find clear documentation on the subject.

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No, there's not a minimum set; you don't have to support any if you don't want to.

Note that in SPDY, this isn't the case; they require you to support gzip. This may be the case in HTTP/2 as well, depending on how discussions go there.