The 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.
A 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 |
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.
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Host | Chrome Full support Yes | Edge Full support 12 | Firefox Full support Yes | IE Full support Yes | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support Yes | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support