The HTTP response status code 301 Moved Permanently is used for permanent redirection, meaning current links or records using the URL that the 301 Moved Permanently response is received for should be updated to the new URL provided in the Location field of the response. This status code should be used with the location header. RFC 2616 states that:
- If a client has link-editing capabilities, it should update all references to the Request URI.
- The response is cachable.
- Unless the request method was HEAD, the entity should contain a small hypertext note with a hyperlink to the new URI(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.
GET /index.php HTTP/1.1 Host: www.example.org
HTTP/1.1 301 Moved Permanently Location: http://www.example.org/index.asp
Search engines 
See also 
- 301 redirects - Webmaster Tools Help - http://support.google.com/webmasters/bin/answer.py?hl=en&answer=93633
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