flight/net/Response.php
public function status($code = null) {
        if ($code === null) {
            return $this->status;
        }

        if (array_key_exists($code, self::$codes)) {
            $this->status = $code;
        }
        else {
            throw new \Exception('Invalid status code.');
        }

        return $this;
    }
public function status($code = null) {
        if ($code === null) {
            return $this->status;
        }

        if (array_key_exists($code, self::$codes)) {
            $this->status = $code;
        }
        else {
            throw new \Exception('Invalid status code.');
        }

        return $this;
    }
Sets the HTTP status of the response.

@param int $code HTTP status code.
@return object|int Self reference
@throws \Exception If invalid status code