Name
Host: hostname: port
Synopsis
The hostname and optional port number of the server contacted by the client. If the port number is 80, the colon and port number should be omitted. For example:
Host: www.ora.com
Or for a port number other than 80 (in this example, 7777):
Host: www.ora.com:7777
This is useful to indicate what server the client thinks it is talking to. It allows multihomed servers to use the same IP address with different DNS names. Clients must supply this information in HTTP 1.1, so servers with multiple hostnames can easily differentiate between ambiguous URLs.
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