Navigation Timing, Headless Chrome, Docker

Dockerfile

FROM node:8.7.0-slim

RUN apt-get update && \
  apt-get install -yq gconf-service libasound2 libatk1.0-0 libc6 libcairo2 libcups2 libdbus-1-3 \
  libexpat1 libfontconfig1 libgcc1 libgconf-2-4 libgdk-pixbuf2.0-0 libglib2.0-0 libgtk-3-0 libnspr4 \
  libpango-1.0-0 libpangocairo-1.0-0 libstdc++6 libx11-6 libx11-xcb1 libxcb1 libxcomposite1 \
  libxcursor1 libxdamage1 libxext6 libxfixes3 libxi6 libxrandr2 libxrender1 libxss1 libxtst6 \
  ca-certificates fonts-liberation libappindicator1 libnss3 lsb-release xdg-utils wget

RUN npm i puppeteer micro qs

RUN echo "\
const { parse } = require('qs')\n\
const { send } = require('micro')\n\
const puppeteer = require('puppeteer')\n\

module.exports = async (req, res) => {\n\
  async function timings (url)  {\n\
    const browser = await puppeteer.launch({\n\
      // ommmmm\n\
      args: ['--disable-setuid-sandbox', '--no-sandbox']\n\
    })\n\
    const page = await browser.newPage()\n\
    await page.goto(url)\n\
    const t = await page.evaluate(() => {\n\
      return window.performance.timing\n\
    })\n\
    await browser.close()\n\
    return t\n\
  }\n\

  let url = req.url\n\
  const index = url.indexOf('?')\n\

  if (index !== -1) {\n\
    url = url.substr(index + 1)\n\
  }\n\

  const query = parse(url)\n\
  const t = await timings(query.url)\n\
  return t\n\
}\n\
" > index.js

CMD ["node_modules/.bin/micro", "index.js"]

I really like this project, it's exactly what I need. But somehow I'm only getting empty responses

Run from the server (outside the container:)

curl http://127.0.0.1:32768/?url=https://daliborgogic.com
{}

The container is running at 0.0.0.0:32768->3000/tcp

Do you have some tips to make this running?