Article:		Doing HTTP Caching Right: Introducing httplib2
Subject:		HTTP Versioning
Date:		2006-02-03 16:41:55
From:		Mark Nottingham
One other thing that's important to understand; just because you get a message saying it's HTTP/1.0, it doesn't mean it can't contain things like Cache-Control. During the long (and still ongoing, as you note) transition to HTTP/1.1, many implmentations selectively use things like the Cache-Control header (which was easy to do), while holding back on things like chunked encoding (which is much harder to code), so they advertised themselves as capable of HTTP/1.0. This is perfectly OK; HTTP versioning allows that. A good read is RFC2145, "Use and Interpretation of HTTP Version Numbers."

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