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


Host: <host>:<port>


the domain name of the server (for virtual hosting).
<port> Optional
TCP port number on which the server is listening.




Specification Title
RFC 7230, section 5.4: Host Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing

Browser compatibility

ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
HostChrome Full support YesEdge Full support 12Firefox Full support YesIE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesFirefox Android Full support YesOpera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yes


Full support
Full support

See also