The Host
request header specifies the domain name of the server (for virtual hosting), and (optionally) the TCP port number on which the server is listening.
If no port is given, the default port for the service requested (e.g., "80" for an HTTP URL) is implied.
A Host
header field must be sent in all HTTP/1.1 request messages. A 400
(Bad Request) status code will be sent to any HTTP/1.1 request message that lacks a Host
header field or contains more than one.
Header type | Request header |
---|---|
Forbidden header name | yes |
Syntax
Host: <host>:<port>
Directives
- <host>
- the domain name of the server (for virtual hosting).
- <port> Optional
- TCP port number on which the server is listening.
Examples
Host: developer.cdn.mozilla.net
Specifications
Specification | Title |
---|---|
RFC 7230, section 5.4: Host | Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Firefox | Edge | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |