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.

The HTTP Referer header is a request-type header that identifies the address of the previous web page, which is linked to the current web page or resource being requested. The usage of this header increases the risk of privacy and security breaches on a website but it allows websites and web servers to identify where the traffic is coming from. May 03, 1994 · Referer: This optional header field allows the client to specify, for the server's benefit, the address of the document (or element within the document) from which the URI in the request was obtained. This allows a server to generate lists of back-links to documents, for interest, logging, etc. It allows bad links to be traced for maintenance. The Referer (sic) header contains the address of the previous web page from which a link to the currently requested page was followed, which has lots of fairly innocent uses including analytics, logging, or optimized caching. However, there are more problematic uses such as tracking or stealing information, or even just side effects such as Apr 27, 2020 · The referer header allows websites to see where a visitor came from. If you clicked on a link to a site from a Google search, for example, the data passed to the target site would note this. Referer header settings are great tools for webmasters, but in the age of digital privacy, they can be seen as a detriment to the end-user’s experience. The Referer header also will not be sent when the link is from a non-HTTP(S) protocol, such as file://, to another page. More Information The Referer header is a standard HTTP header in the form of "Referer: ," which indicates to a Web server the URL of the page that contained the hyperlink to the currently requested URL. The Cache-Control: no-cache HTTP/1.1 header field is also intended for use in requests made by the client. It is a means for the browser to tell the server and any intermediate caches that it wants a fresh version of the resource. The Pragma: no-cache header field, defined in the HTTP/1.0 spec, has the same purpose. It, however, is only defined Feb 11, 2015 · This information is automatically appended to the HTTP header field when requesting a new webpage, and is known as an HTTP Referer (originally a misspelling of referrer). While generally a useful piece of information for visited websites, the information contained in a referrer can be abused to track website visitors across the internet

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HTTP Referer Leak - YouTube

Apr 03, 2014 HttpWebRequest.Referer Property (System.Net) | Microsoft Docs public string Referer { get; set; } member this.Referer : string with get, set Public Property Referer As String Property Value String. The value of the Referer HTTP header. The default value is null. Examples. The following code example sets the Referer property. // Create a 'HttpWebRequest' object. Cross-Site Request Forgery Prevention - OWASP