Host request header specifies the host and port
number of the server to which the request is being sent.
If no port is included, the default port for the service requested is implied (e.g.,
443 for an HTTPS URL, and
80 for an HTTP URL).
Host header field must be sent in all HTTP/1.1 request messages. A
400 (Bad Request) status code may be sent to any HTTP/1.1 request
message that lacks or contains more than one
Host header field.
the domain name of the server (for virtual hosting).
- <port> Optional
TCP port number on which the server is listening.
|Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing |
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