>Naive question: can you specify Max-Age on a 1.1 response and Expires on a >1.0 response? Or are you likely to run into problems with proxies giving the >1.1 response to 1.0 clients? (I know they're not supposed to.) Both are 1.x header fields. If the recipient understands cache-control and max-age, then it will ignore Expires. Otherwise, it will ignore the cache-control. Therefore, it is best to send both. There is nothing wrong with sending an HTTP/1.1 response to an HTTP/1.0 client. There are some features of HTTP/1.1 that cannot be used with an HTTP/1.0 client, but that's different (and aren't related to caching). ....RoyReceived on Saturday, 22 May 1999 23:24:00 UTC
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