Would anyone advice me when and how i can use the 'head' request.. that will invoke the doHead() method on a servlet?
Pl. brief what is the effect of the response made within the 'doHead()' method.
Thanks in adv...
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 cacheable 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.
I think the most important use is to determine the last modification date of a page to save on bandwidth and CPU time.
[ May 29, 2004: Message edited by: William Brogden ]
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