From W3C Wiki
The HTTP/1.1 specification in RFC 2616 defines the response code Â303 See OtherÂ in section 10.3.4 as a type of redirection. The meaning of 303 is basically, ÂUse the GET method to retrieve this other resource that is not necessarily a replacement for, version of, or representation of the requested resource.Â
If you use the Apache HTTP server, this type of redirection is easy to configure. The Apache documentation of the ÂRedirectÂ directive is good, but misstates the semantics of the Â303Â response code.