puppeteer开启chromium，报UnhandledPromiseRejectionWarning？

Question

const puppeteer = require('puppeteer');

(async () => {
  const browser = await puppeteer.launch({
    devtools: true,
    ignoreHTTPSErrors: true
  });

  const page = await browser.newPage();
  page.setUserAgent('Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1');
  page.setViewport({
    width: 375,
    height: 667,
    isMobile: true
  });
  await page.goto('https://baidu.com', {
    waitUntil: 'networkidle2'
  });
  await browser.close();
})();

node以上代码会报错，去除page.setViewport中的isMobile参数后正常了，这是什么原因造成的？怎么解决呢？

chromium正常打开，链接没打开，报错

报错信息：

> node index

(node:13560) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: net::ERR_ABORTED at https://baidu.com
(node:13560) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

---

再问个问题，打开chromium后，自动打开devtools，怎么让这个开发者工具自动设置成手机视图，就是下面这个模式：

Answer 1

page.setViewport前加await