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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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Obvious answer: PUT, DELETE, TRACE, OPTIONS, CONNECT methods
Most people know about the GET and POST methods because that's what they use when building forms. Browsers also use HEAD a lot. The other methods are much less well-known; they are mostly used by more specific applications.