src/AbstractTransport.php
public function withRequest(RequestInterface $request)
    {
        $object = clone $this;
        $object->request = $request;
        $object->method  = $request->getMethod();
        return $object;
    }
public function withRequest(RequestInterface $request)
    {
        $object = clone $this;
        $object->request = $request;
        $object->method  = $request->getMethod();
        return $object;
    }
With Set Request

@param RequestInterface $request
@return mixed