public function send()
    {
        header(
            sprintf(
                'HTTP/1.1 %s %s',
                $this->statusCode,
                self::codeToReason($this->statusCode)
            )
        );
        foreach ($this->headers as $k => $v) {
            header(
                sprintf('%s: %s', $k, $v)
            );
        }
        echo $this->body;
    }