The HTTP referer (a misspelling of referrer) is an optional HTTP header field that identifies the address of the webpage (i.e., the URI or IRI) which is linked to the resource being requested. By checking the referrer, the new webpage can see where the request originated.
Although this header has many innocent uses it can have undesirable consequences for user security and privacy.
The referrer used to request this page was:
HTTP Crawler Test Site