HTTP 301

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The HTTP 301 status code, commonly referred to as “Moved Permanently,” is a response status from a web server signifying a permanent URL redirection. This typically happens when a webpage has been relocated and the original URL is no longer applicable. The server, when issuing a 301 status code, also provides the new URL in the “Location” field. This code is particularly significant for search engine optimization (SEO) as it enables search engines to revise their databases and transfer any link equity from the old to the newly provided URL. Nevertheless, it’s vital to use 301 redirects judiciously to prevent extended page load times and potential SEO value dilution. Additionally, when transitioning from HTTP to HTTPS, ensure that all page resources are loaded via HTTPS to avoid mixed content complications. Lastly, keep in mind that numerous web browsers cache 301 redirects, meaning they will automatically reroute any future requests to the new URL.

HTTP 301 (Wikipedia)

On the World Wide Web, HTTP 301 is the HTTP response status code for 301 Moved Permanently. 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 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.
  • Unless the request method was HEAD, the entity should contain a small hypertext note with a hyperlink to the new URL(s).
  • If the 301 status code is received in response to a request of any type other than GET or HEAD, the client must ask the user before redirecting.
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