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.
Note that referer is actually a misspelling of the word "referrer". See HTTP referer on Wikipedia for more details.
Referer header has the potential to reveal information about the browsing history of the user, which is a privacy concern.
Referer header is not sent by browsers if:
an unsecured HTTP request is used and the referring page was received with a secure protocol (HTTPS).
|RFC 7231, section 5.5.2: Referer||Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content|
|Feature||Android webview||Chrome for Android||Edge mobile||Firefox for Android||IE mobile||Opera Android||iOS Safari|
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