Test hypertext links for validity, accessibility, and recent modification

Https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html

The HEAD method is identical to GET except, 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 being identical to the information Sen T in response to a GET request. This method can is used for obtaining metainformation on the entity implied by the request without transferring the ENT Ity-body itself. This method was often used for testing hypertext links for validity, accessibility, and recent modification.

The response to a HEAD request is cacheable in the sense of the information contained in the response is used to Update a previously cached entity from that resource. If The new field values indicate the cached entity differs from the current entity (as would being indicated by a In Content-length, CONTENT-MD5, ETag, or last-modified), then the cache must treat the cache entry as stale.

Test hypertext links for validity, accessibility, and recent modification