As it stated at [MDN](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/307) _The method and the body of the original request are reused to perform the redirected request._ But [here](https://github.com/reactphp/http/blob/bc537273d11ee769c723a830e63aa33c0c35a530/src/Io/Transaction.php#L265) request is converted from POST to GET.