host-rules ignored

Steps to reproduce

Tell us about your environment:

• Puppeteer version: 0.13.0
• Platform / OS version: Debian Stretch 9.2
• Node.js version: 8.9.3

What steps will reproduce the problem?

const puppeteer = require('puppeteer');
async function run() {
  a = [
    "--host-rules='MAP * 127.0.0.1'",
    '--no-sandbox',
  ];
  const browser = await puppeteer.launch({args: a});
  const page = await browser.newPage();
  await page.goto('http://www.example.org');
  console.log(await page.content());
  browser.close();
}
run();

What is the expected result? I expected 127.0.0.1 to be contacted for the web page and then an HTTP 404 error (I am not running a web server on localhost).

What happens instead? Retrieves the web page from www.example.org and prints HTML on the console.

[JoelEinbinder]

Remove the quotes:

  a = [
    "--host-rules=MAP * 127.0.0.1",
    '--no-sandbox',
  ];

[stephanreiter]

Filed it here: https://bugs.chromium.org/p/chromium/issues/detail?id=798793&q=component%3AInternals>Headless