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301
Redirection

301 Moved Permanently

301 Moved Permanently — URL has permanently moved to the new address in the Location header. Search engines update their index; link equity is preserved.

Description

The 301 Moved Permanently status code indicates that the requested resource has been permanently assigned a new URI. Future references should use the new URI provided in the Location header.

Search engines transfer the SEO value (link equity) from the old URL to the new one. This is the recommended redirect for permanent URL changes.

Common Causes

URL structure change (migration to a new CMS/framework) HTTP to HTTPS migration Domain consolidation (www → non-www or vice versa) Language prefix change Trailing-slash normalisation

How to Fix

Ensure the redirect chain is ≤ 2 hops (check here). All old URLs should redirect to the new canonical. Update internal links to the new URLs (don't rely on redirects alone). Ensure sitemap.xml contains only new URLs.

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Related Status Codes

300
300 Multiple Choices
Multiple options are available for the requested resource; the client should choose one.
 302
302 Found
302 Found — temporary redirect. Unlike 301, search engines do not update the index and link equity is NOT passed to the new URL.
 303
303 See Other
The response to the request can be found under a different URL using a GET method.
 304
304 Not Modified
The resource has not been modified since the last request.
 307
307 Temporary Redirect
The request should be repeated with another URI but the method must not change.
 308
308 Permanent Redirect
The resource has permanently moved and the request method must not change.

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