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14.23 Host Connected: An Internet Encyclopedia
14.23 Host

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14.23 Host

14.23 Host

The Host request-header field specifies the Internet host and port number of the resource being requested, as obtained from the original URL given by the user or referring resource (generally an HTTP URL, as described in section 3.2.2). The Host field value MUST represent the network location of the origin server or gateway given by the original URL. This allows the origin server or gateway to differentiate between internally-ambiguous URLs, such as the root "/" URL of a server for multiple host names on a single IP address.

          Host = "Host" ":" host [ ":" port ]    ; Section 3.2.2

A "host" without any trailing port information implies the default port for the service requested (e.g., "80" for an HTTP URL). For example, a request on the origin server for <http://www.w3.org/pub/WWW/> MUST include:

          GET /pub/WWW/ HTTP/1.1
          Host: www.w3.org

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.


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Connected: An Internet Encyclopedia
14.23 Host

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