The Origin request header indicates where a fetch originates from. It doesn't include any path information, but only the server name. It is sent with CORS requests, as well as with POST requests. It is similar to the Referer header, but, unlike this header, it doesn't disclose the whole path.

Note: The Origin header is not set on Fetch requests with a method of HEAD or GET (this behavior was corrected in Firefox 65 — see bug 1508661).

Header type Request header
Forbidden header name yes


Origin: null
Origin: <scheme> "://" <hostname> [ ":" <port> ]


The protocol that is used. Usually it is the HTTP protocol or its secured version, HTTPS.
The domain name of the server (for virtual hosting) or the IP.
<port> Optional
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.


Origin: https://developer.mozilla.org


Specification Comment
RFC 6454, section 7: Origin The Web Origin Concept
The definition of 'Origin header' in that specification.
Supplants the Origin header as defined in RFC6454.

Browser compatibility

BCD tables only load in the browser

See also