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.


Origin: ""
Origin: <scheme> "://" <host> [ ":" <port> ]

Origin can be the empty string: this is useful, for example, if the source is a data URL.


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

Feature Chrome Edge Firefox Internet Explorer Opera Safari
Basic support Yes Yes1 Yes2 Yes Yes Yes
Feature Android webview Chrome for Android Edge mobile Firefox for Android IE mobile Opera Android iOS Safari
Basic support Yes Yes Yes Yes2 Yes Yes Yes

1. Not sent with POST requests, see bug 10482384.

2. Not sent with POST requests, see bug 446344.

See also

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