code: def http_get(url, url_params={}, endpoint="plain")
        url_params = url_params.merge(access_token_param)
        WeixinAuthorize.http_get_without_token(url, url_params, endpoint)
      end
docs: 暴露出：http_get,http_post两个方法，方便第三方开发者扩展未开发的微信API。