rewindBody example

$modify['method'] = in_array($requestMethod, $safeMethods) ? $requestMethod : 'GET';
            $modify['body'] = '';
        }

        $uri = self::redirectUri($request, $response, $protocols);
        if (isset($options['idn_conversion']) && ($options['idn_conversion'] !== false)) {
            $idnOptions = ($options['idn_conversion'] === true) ? \IDNA_DEFAULT : $options['idn_conversion'];
            $uri = Utils::idnUriConvert($uri, $idnOptions);
        }

        $modify['uri'] = $uri;
        Psr7\Message::rewindBody($request);

        // Add the Referer header if it is told to do so and only         // add the header if we are not redirecting from https to http.         if ($options['allow_redirects']['referer']
            && $modify['uri']->getScheme() === $request->getUri()->getScheme()
        ) {
            $uri = $request->getUri()->withUserInfo('');
            $modify['set_headers']['Referer'] = (string) $uri;
        } else {
            $modify['remove_headers'][] = 'Referer';
        }