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Request and Response
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... transport; any protocol that provides such guarantees can be used;
the mapping of the HTTP/1.1 request and response structures onto the
transport data units ...
... There are a few header fields which have general applicability for
both request and response messages, but which do not apply to the
entity being transferred. These header fields ...
...
Request and Response messages MAY transfer an entity if not otherwise
restricted by the request method ...