Difference between no-cache and must-revalidate

Question

From the RFC 2616

http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.1

no-cache

If the no-cache directive does not spe

Answer 1

I think there is a difference between max-age=0, must-revalidate and no-cache:

In the must-revalidate case the client is allowed to send a If-Modified-Since request and serve the response from cache if 304 Not Modified is returned.

In the no-cache case, the client must not cache the response, so should not use If-Modified-Since.