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9.4 HEAD Connected: An Internet Encyclopedia
9.4 HEAD

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Up: RFC 2068
Up: 9 Method Definitions
Prev: 9.3 GET
Next: 9.5 POST

9.4 HEAD

9.4 HEAD

The HEAD method is identical to GET except that the server MUST NOT return a message-body in the response. The metainformation contained in the HTTP headers in response to a HEAD request SHOULD be identical to the information sent in response to a GET request. This method can be used for obtaining metainformation about the entity implied by the request without transferring the entity-body itself. This method is often used for testing hypertext links for validity, accessibility, and recent modification.

The response to a HEAD request may be cachable in the sense that the information contained in the response may be used to update a previously cached entity from that resource. If the new field values indicate that the cached entity differs from the current entity (as would be indicated by a change in Content-Length, Content-MD5, ETag or Last-Modified), then the cache MUST treat the cache entry as stale.


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Connected: An Internet Encyclopedia
9.4 HEAD

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