301 Moved Permanently

A HTTP 301 response given in response to a HTTP request means that a new permanent URL has been assigned to the requested resource and any future references to the resource should use the returned URL.

The new permanent URL should be given by the Location field in the HTTP 301 response. In addition, the entity of the response should contain a short hypertext note with a hyperlink to the new URL (unless the request method was HEAD).

A search engine that receives a HTTP 301 response upon requesting a given URL is likely to:

index the content found at the Location field, under the URL given in the Location field, rather than the requested URL
pass link rank weight from the page containing the link to the requested URL, to the page given in the Location field