Function cookie

lib/extend/controller.js:185–187

* get or set cookies * @param {String} name * @param {String} value * @param {Object} options

(name, value, options)

   * @param {Object} options
   */
  cookie(name, value, options) {
    return this.ctx.cookie(name, value, options);
  },
  /**
   * get or set header
   * @param {String} name