'use strict';

const puppeteer = require('puppeteer');

(async function main() {
  try {
    const browser = await puppeteer.launch({ headless: false });
    const page = await browser.newPage();

    page.on('console', (msg) => { console.log(msg.text()); });
    page.on('pageerror', (exceptionMessage) => { console.log(exceptionMessage); });

    const result = await page.evaluate(async () => {
      try {
        const status = await new Promise((resolve, reject) => {
          const xhr = new XMLHttpRequest();
          xhr.onreadystatechange = () => {
            if (xhr.readyState === 4) {
              if (xhr.status === 200) resolve(`good status: ${xhr.status}`);
              else reject(`bad status: ${xhr.status}`);
            }
          };
          xhr.onerror = () => { reject('xhr error'); };
          xhr.open('GET', 'https://example.org/');
          xhr.send();
        });
        return status;
      } catch (err) {
        return err;
      }
    });
    console.log(result);
  } catch (err) {
    console.error(err);
  }
})();