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 (e.g.,
443 for an HTTPS URL, and
80 for an HTTP URL) is implied.
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 a
Host header field or that contains more than one.
|Header type||Request header|
|Forbidden header name||yes|
- the domain name of the server (for virtual hosting).
- <port> Optional
- TCP port number on which the server is listening.
|RFC 7230, section 5.4: Host||Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing|
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