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is an HTTP header field that identifies the address of the webpage (i.e. the URI or IRI) that linked to the resource being requested. By checking the referer, the new webpage can see where the request originated.

In the most common situation this means that when a user clicks a hyperlink in a web browser, the browser sends a request to the server holding the destination webpage. The request includes the referer field, which indicates the last page the user was on (the one where they clicked the link). Referer logging is used to allow websites and web servers to identify where people are visiting them from, for promotional or statistical purposes.[1]

^ Kyrnin, Jennifer (2012-04-10). "Referrer - What is a Referrer - How do HTTP Referrers Work?". About.com. Retrieved 2013-03-20.  Jump up ^ Hallam-Baker, Philip (2000-09-21). "Re: Is Al Gore The Father of the Internet?". alt.folklore.computers. Retrieved 2013-03-20.  Jump up ^ Fielding, Roy (1995-03-09). "Re: Referer: (sic)". ietf-http-wg-old. Retrieved 2013-03-20.  Jump up ^ "Hypertext Transfer Protocol -- HTTP/1.1 (RFC 2616 § 14.36)". IETF. June 1999. Retrieved 2013-03-20. "The Referer[sic] request-header field allows the client to specify […] the address (URI) of the resource from which the Request-URI was obtained […]"  ^ Jump up to: a b "Network.http.sendRefererHeader". MozillaZine. 2007-06-10. Retrieved 2013-03-20.  Jump up ^ "HTML DOM Document referrer Property". w3schools.com. Retrieved 2013-03-20.  Jump up ^ Gundersen, Bret (2011-10-19). "The Impact of Google Encrypted Search". Adobe Digital Marketing Blog. Retrieved 2013-03-20.  Jump up ^ "HTML Techniques for Web Content Accessibility Guidelines 1.0: The META element". W3C. 2000-11-06. Retrieved 2013-03-20.  Jump up ^ "Hypertext Transfer Protocol -- HTTP/1.1: Encoding Sensitive Information in URI's (RFC 2616 § 15.1.3)". IETF. June 1999. Retrieved 2013-03-20. "Clients SHOULD NOT include a Referer[sic] header field in a (non-secure) HTTP request if the referring page was transferred with a secure protocol"  Jump up ^ "4.12 Links — HTML Living Standard: 4.12.5.8 Link type "noreferrer"". WHATWG. 2013-03-20. Retrieved 2013-03-20.

pythonを複数バージョン使っている場合はバージョンごとにビルドする必要がある。