get cookies() {
        // Return from cache if already parsed once
        if (this._cookies) return this._cookies;

        // Parse cookies from Cookie header and cache results
        const header = this.headers['cookie'];
        this._cookies = header ? cookie.parse(header) : {};

        // Return the cookies
        return this._cookies;
    }
Returns request cookies from incoming request.
@returns {Object.<string, string>}