Promise

class \Http\Adapter\Guzzle7\Promise implements \Http\Promise\Promise
class \Http\Client\Promise\HttpFulfilledPromise implements \Http\Promise\Promise
class \Http\Client\Promise\HttpRejectedPromise implements \Http\Promise\Promise
class \Http\Promise\FulfilledPromise implements \Http\Promise\Promise
class \Http\Promise\RejectedPromise implements \Http\Promise\Promise