Prerender detection about prerenderer HOT 3 CLOSED

I see two options here:

• Look for HeadlessChrome in the default UserAgent value: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/85.0.4182.0 Safari/537.36
• Launch puppeteer with the --user-agent=asdf arg. This will require changes in the prerenderer repo. (See next comment)

Example to demonstrate the principle:

async function getPuppeteerChromeUA() {
  const puppeteer = require("puppeteer");
  const browser = await puppeteer.launch({
    args: ['--user-agent=hhh'],
  });
  const ua = await browser.userAgent();
  await browser.close();
  return ua;
}

getPuppeteerChromeUA().then((ua) => {
  console.log(ua);
});

from prerenderer.

It turns out, you can pass any command line arg for puppeteer like this:

const prerenderer = new Prerenderer({
  // ...
  renderer: new PuppeteerRenderer({
    // ...
    args: ["--user-agent=moo"],
  }),
});

from prerenderer.

I'll just add a note that you can also use '__PRERENDER_INJECTED' in window which is set by default rather than the user agent

from prerenderer.