HTTP 301 – Moved Permanently
The resource has been permanently moved to a new URL, given in the Location header.
Common use case
The standard way to permanently redirect old URLs to new ones after a site restructure or domain change, while passing along most of the original page's SEO value.
Example
HTTP/1.1 301 Moved Permanently
Location: https://example.com/new-path
History
Part of HTTP/1.0 (RFC 1945, 1996).
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Search engines treat 301s as a strong signal to transfer ranking authority ('link juice') from the old URL to the new one, which is why it is preferred over 302 for permanent moves.