Host header
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The HTTPHostrequest 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, and80 for an HTTP URL).
AHost header field must be sent in all HTTP/1.1 request messages.A400 Bad Request status code may be sent to any HTTP/1.1 request message that lacks or contains more than oneHost header field.
| Header type | Request header |
|---|---|
| Forbidden request header | Yes |
Syntax
http
Host: <host>:<port>Directives
<host>The domain name of the server (for virtual hosting).
<port>OptionalTCP port number on which the server is listening.
Examples
http
Host: developer.mozilla.orgSpecifications
| Specification |
|---|
| HTTP Semantics # field.host |