src/Promise.php
public function reject(Exception $exception)
    {
        if (HttpPromise::PENDING !== $this->state) {
            throw new \RuntimeException('Promise is already resolved');
        }

        $this->state = HttpPromise::REJECTED;
        $this->exception = $exception;
        $this->doReject($exception);
    }
public function reject(Exception $exception)
    {
        if (HttpPromise::PENDING !== $this->state) {
            throw new \RuntimeException('Promise is already resolved');
        }

        $this->state = HttpPromise::REJECTED;
        $this->exception = $exception;
        $this->doReject($exception);
    }
Reject this promise.

@param Exception $exception

@internal