def redirect_request(self, req, fp, code, msg, headers, newurl):
        """Return a Request or None in response to a redirect.

        This is called by the http_error_30x methods when a
        redirection response is received.  If a redirection should
        take place, return a new Request to allow http_error_30x to
        perform the redirect.  Otherwise, raise HTTPError if no-one
        else should try to handle this url.  Return None if you can't
        but another Handler might.
        """
        m = req.get_method()
        if (code in (301, 302, 303, 307) and m in ("GET", "HEAD")
            or code in (301, 302, 303) and m == "POST"):
            # Strictly (according to RFC 2616), 301 or 302 in response
            # to a POST MUST NOT cause a redirection without confirmation
            # from the user (of urllib2, in this case).  In practice,
            # essentially all clients do redirect in this case, so we
            # do the same.
            # be conciliant with URIs containing a space
            newurl = newurl.replace(' ', '%20')
            newheaders = dict((k,v) for k,v in req.headers.items()
                              if k.lower() not in ("content-length", "content-type")
                             )
            return urllib2.Request(newurl,
                           headers=newheaders,
                           origin_req_host=req.get_origin_req_host(),
                           unverifiable=True)
        else:
            raise urllib2.HTTPError(req.get_full_url(), code, msg, headers, fp)
dataset/ETHPy150Open jyr/opentumblr/poster/streaminghttp.py/StreamingHTTPRedirectHandler.redirect_request/original