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A persistent uniform resource locator (PURL) is a uniform resource locator (URL) (i.e., location-based uniform resource identifier or URI) that is used to redirect to the location of the requested web resource. PURLs redirect HTTP clients using HTTP status codes.
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URL redirection, also called URL forwarding, is a World Wide Web technique for making a web page available under more than one URL address. When a web browser attempts to open a URL that has been redirected, a page with a different URL is opened.
Doorway pages that redirect visitors without their knowledge use some form of cloaking. This usually falls under Black Hat SEO. If a visitor clicks through to a typical doorway page from a search engine results page, in most cases they will be redirected with a fast Meta refresh command to another page.
An ISP redirect page is a spoof page served by major ISPs including: Cox Communications, [1] Embarq, Verizon, Rogers, Earthlink, and various others when World Wide Web users enter an invalid DNS name. [citation needed]
A common method is to direct all World Wide Web traffic to a web server, which returns an HTTP redirect to a captive portal. [8] When a modern, Internet-enabled device first connects to a network, it sends out an HTTP request to a detection URL predefined by its vendor and expects an HTTP status code 200 OK or 204 No Content.