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It is used for permanent redirecting, meaning that links or records returning this response should be updated. 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:
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.
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to the redirected page) 302 found (originally "temporary redirect" in HTTP/1.0 and popularly used for CGI scripts; superseded by 303 and 307 in HTTP/1.1 but preserved for backward compatibility)
A HTTP 301 redirect (301 Moved Permanently) is a method of dealing with duplicate content to redirect users and search engine crawlers to the single pertinent ...
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.
Permanent RFC 9111: Connection: Control options for the current connection and list of hop-by-hop request fields. [13] Must not be used with HTTP/2. [14] Connection: keep-alive. Connection: Upgrade. Permanent RFC 9110: Content-Encoding: The type of encoding used on the data. See HTTP compression. Content-Encoding: gzip: Permanent RFC 9110 ...
There are principally two types of redirects used: [note 2] HTTP 301 (permanent redirect) and HTTP 302 (regular redirect). In the former it is recommended that the site update the URL to use the new address. While in contrast, the latter is optional and should be reviewed by a human operator.
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.