• 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.

More info in RFC 2616

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