connect('google.com:443')->then( * function (React\Socket\ConnectionInterface $connection) { * // connection successfully established * }, * function (Exception $error) { * // failed to connect due to $error * } * ); * ``` * * The returned Promise MUST be implemented in such a way that it can be * cancelled when it is still pending. Cancelling a pending promise MUST * reject its value with an Exception. It SHOULD clean up any underlying * resources and references as applicable. * * ```php * $promise = $connector->connect($uri); * * $promise->cancel(); * ``` * * @param string $uri * @return \React\Promise\PromiseInterface * Resolves with a `ConnectionInterface` on success or rejects with an `Exception` on error. * @see ConnectionInterface */ public function connect($uri); }