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Synopsis: Apache requires Host: header even when given an absolute URI

State-Changed-From-To: open-closed
State-Changed-By: coar
State-Changed-When: Sat Jun 13 15:06:51 PDT 1998
State-Changed-Why:
The Host request header field is always required for
all HTTP/1.1 requests.  From section 14.23 of RFC2068:

   A client MUST include a Host header field in all HTTP/1.1 request
   messages on the Internet (i.e., on any message corresponding to a
   request for a URL which includes an Internet host address for the
   service being requested). If the Host field is not already present,
   an HTTP/1.1 proxy MUST add a Host field to the request message prior
   to forwarding it on the Internet. All Internet-based HTTP/1.1 servers
   MUST respond with a 400 status code to any HTTP/1.1 request message
   which lacks a Host header field.

   See sections 5.2 and 19.5.1 for other requirements relating to Host.

The header field must always be present.  Its value may
be ignored, but it cannot be omitted.

The Apache Web server is doing exactly what it is required
to do.  Thanks for using it!

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