Hidden features of HTTP

Posted by Gumbo on Stack Overflow See other posts from Stack Overflow or by Gumbo
Published on 2009-06-05T08:52:00Z Indexed on 2010/05/13 2:34 UTC
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What hidden features of HTTP do you think are worth mentioning?

By hidden features I mean features that already are part of the standard but widely rather unknown or unused.

Just one feature per answer please.

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