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This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2] A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD. A user agent may automatically redirect a request.
The HTTP response status code 302 Found is a common way of performing URL redirection. The HTTP/1.0 specification (RFC 1945) initially defined this code, and gave it the description phrase "Moved Temporarily" rather than "Found". An HTTP response with this status code will additionally provide a URL in the header field Location.
URL hijacking is an off-domain redirect technique [3] that exploited the nature of the search engine's handling for temporary redirects. If a temporary redirect is encountered, search engines have to decide whether they assign the ranking value to the URL that initializes the redirect or to the redirect target URL.
In the first case, it is better to employ URL mapping or URL redirection by returning a 301 Moved Permanently response, which can be configured in most server configuration files, or through URL rewriting; in the second case, a 410 Gone should be returned. Because these two options require special server configuration, most websites do not make ...
The new URL should be provided in the Location field, included with the response. The 301 redirect is considered a best practice for upgrading users from HTTP to HTTPS. RFC 2616 [1] states that: If a client has link-editing capabilities, it should update all references to the Request URL. The response is cacheable unless indicated otherwise.
about is an internal URI scheme (also known as a "URL scheme" or, erroneously, "protocol") implemented in various web browsers to reveal internal state and built-in functions. It is an IANA officially registered scheme , and is standardized.
When an entity intercepts the request and returns status 451, it should include a "Link" HTTP header field whose value is a URI reference identifying itself. The "Link" header field must then have a "rel" parameter whose value is "blocked-by".
The algorithm used to calculate the "origin" of a URI is specified in RFC 6454, Section 4. For absolute URIs, the origin is the triple {scheme, host, port}. If the URI does not use a hierarchical element as a naming authority (see RFC 3986 , Section 3.2) or if the URI is not an absolute URI, then a globally unique identifier is used.