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Caching Behavior: Many web browsers cache 301 redirects. This means that once a user's browser encounters a 301 redirect, subsequent requests to the original URL will be automatically directed to the new URL without contacting the server. Updating Bookmarks: Browsers may update bookmarks to reflect the new URL after encountering a 301 redirect.
308 Permanent Redirect This and all future requests should be directed to the given URI . 308 parallels the behavior of 301, but does not allow the HTTP method to change . So, for example, submitting a form to a permanently redirected resource may continue smoothly.
Some operators prefer to use PURLs of type 301 (indicating that the final URI should be addressed in future requests). A PURL of type "chain" allows a PURL to redirect to another PURL in a manner identical to a 301 or 302 redirection, with the difference that a PURL server will handle the redirection internally for greater efficiency.
301 moved permanently (redirects permanently from one URL to another passing link equity to the redirected page) 302 found (originally "temporary redirect" in HTTP/1.0 and popularly used for CGI scripts; superseded by 303 and 307 in HTTP/1.1 but preserved for backward compatibility)
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Not all redirection is treated equally; the redirection instruction sent to a browser can contain in its header HTTP response status codes such as 301 (moved permanently), 302 (found), 307 (temporary redirect) or 308 (permanent redirect). There are several techniques to implement URL shortening.
To ask a web browser to load a different web page (URL redirection). In this circumstance, the Location header should be sent with an HTTP status code of 3xx. It is passed as part of the response by a web server when the requested URI has: Moved temporarily; Moved permanently; or
Archived or Ghost redirect. Redirect link rot. For example, a 301 header was deleted and became a 404, but the old 301 information is still preserved in the Wayback Machine. Useful to discover redirect information no longer on the live web. See also Ghostredir repo. Soft-200 or False 404. A URL that appears to be dead but is actually live.