Referer request header contains the address of the previous web page from which a link to the currently requested page was followed. The
Referer header allows servers to identify where people are visiting them from and may use that data for analytics, logging, or optimized caching, for example.
Important: Although this header has many innocent uses it can have undesirable consequences for user security and privacy. See Referer header: privacy and security concerns for more information and mitigations.
Note that referer is actually a misspelling of the word "referrer". See HTTP referer on Wikipedia for more details.
Referer header is not sent by browsers if:
|RFC 7231, section 5.5.2: Referer||Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content|
|Android webview||Chrome for Android||Edge Mobile||Firefox for Android||Opera for Android||iOS Safari||Samsung Internet|
© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.