Referer
The Referer
HTTP request header contains an absolute or partial address of the page that makes the request.
The Referer
header allows a server to identify a page where people are visiting it from.
This data can be used for analytics, logging, optimized caching, and more.
When you follow a link, the Referer
contains the address of the page that owns the link. When you make resource requests to another domain, the Referer
contains the address of the page that uses the requested resource.
The Referer
header can contain an origin, path, and querystring, and may not contain URL fragments (i.e. "#section") or "username:password" information.
The request's referrer policy defines the data that can be included. See Referrer-Policy
for more information and examples.
Note: The header name "referer" is actually a misspelling of the word "referrer". See HTTP referer on Wikipedia for more details.
Warning: This header may have undesirable consequences for user security and privacy. See Referer header: privacy and security concerns for more information and mitigations.
Header type | Request header |
---|---|
Forbidden header name | yes |
Syntax
Referer: <url>
Directives
- <url>
-
An absolute or partial address of the web page that makes the request. URL fragments (i.e. "#section") and userinfo (i.e. "username:password" in "https://username:password@example.com/foo/bar/") are not included. Origin, path, and querystring may be included, depending on the referrer policy.
Examples
Referer: https://developer.mozilla.org/en-US/docs/Web/JavaScript
Referer: https://example.com/page?q=123
Referer: https://example.com/
Specifications
Specification |
---|
Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content # header.referer |
Browser compatibility
BCD tables only load in the browser