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Can a client force the origin server to ignore its cache when generating the response? For example, can it send Cache-Control: no-cache in a request? The RFC only seems to discuss Cache-Control: no-cache in the context of a response, not a request.
Answering my own question…
According to http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.1.6:
A client's request MAY specify the maximum age it is willing to accept of an unvalidated response; specifying a value of zero forces the cache(s) to revalidate all responses.According to http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.4
The request includes a "no-cache" cache-control directive [...] The server MUST NOT use a cached copy when responding to such a request.