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Headless browser in Azure functions JavaScript?


Headless browser in Azure functions JavaScript?

By : user2172522
Date : October 23 2020, 08:10 PM
I wish did fix the issue. There are many restrictions on Azure App Service (includes WebApps, Function Apps), such as Win32k.sys (User32/GDI32) Restrictions. So some packages are not supported on Azure App Service, which like PhantomJS/puppteer be required to start a headless browser which needs GDI support to communicate with javascript/nodejs to get DOM node.
You can scrape a static web page or only HTML via Node http.ClientRequest or Request package in Function App. If to scrape a DOM node of a web page dynamically, the only way is using PhantomJS/puppteer on Azure VM, not Function Apps.
code :


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headless browser or browser control with ajax/javascript/proxy and multithread support?

headless browser or browser control with ajax/javascript/proxy and multithread support?


By : Johannes Reiners
Date : March 29 2020, 07:55 AM
this will help So far the best solution I have found was using awesomium, it uses very little memory when used headless, allowing me to spawn lots of processes, compared to selenium and others solution and have a good support for AJAX, JavaScript, proxy, and more.
For the time being I will leave my own answer marked however if anyone posts a better option that meets my requirements I will change it.
Javascript loops, async functions and headless browser

Javascript loops, async functions and headless browser


By : user3650815
Date : March 29 2020, 07:55 AM
To fix this issue By playing with the new headless browser playwright from microsoft, I contsructed something that neither returns an error nore something else. , There are a few things you can improve in your code:
code :
(async()=>{

  log('start playwright async');

  let maxRunners = 1;
  let running = 0;
  let list = [1,2,3,4,5,6,7,8,9,0,11,12,13,14,15];

  log('start job');
  const promises = [];
  while (list.length > 0) {

      if (running < maxRunners) {
          log('runner started');
          running++;

          let entry = list[0];
          list.shift();

          log('start browser loop');
          for (const browserType of ['chromium', 'firefox', 'webkit']) {
              log('fire async');
              promises.push((async () => {
                  log('loop next');
                  log('launch: ', browserType);
                  const browser = await playwright[browserType].launch({
                      headless: false
                  });
                  log(browserType, ' launched');
                  const context = await browser.newContext();
                  log('open new page');
                  const page = await context.newPage('http://whatsmyuseragent.org/');
                  log('page opened');
                  log('make screenshot');
                  await page.screenshot({path: `example-${browserType}.png`});
                  log('screenshot made');
                  log('close browser');
                  await browser.close();
                  log('browser closed');
                  log('loop succeed');

                  running--;
              })());
              log('end async');
          }
          log('end loop');
      } else {
        await Promise.all(promises);
      }
  }

  await Promise.all(promises);
  log('job finished');
  log('end playwright script');

  function log(...msgs) {
      let date = new Date();
      let timeString = date.toISOString().substr(11, 8);
      //date.setSeconds(45); // specify value for SECONDS here
      //var timeString = date.toISOString().substr(11, 8);
      let msg = '';
      for (let i in msgs) {
          msg += msgs[i];
      }

      console.log(timeString, ':', msg);
  }
})()
(async()=>{
)();
const promises = [];
...
log('fire async');
promises.push((async () => {
})());
if (running < maxRunners) {
...
} else {
   await Promise.all(promises);
}
I need to run headless browser on ec2 using selenium python. I tried chrome headless but it didn't work

I need to run headless browser on ec2 using selenium python. I tried chrome headless but it didn't work


By : hubo
Date : March 29 2020, 07:55 AM
this one helps. Okie seems like they have a bug in installation of module
It will only work when you are running under a virtual environment and not when you are using direct system pip installation. The issue occurs because for direct install the drivers are download to /usr/local and it expects them to be available at the package location.
How to run Headless Chrome in Azure Cloud Service or Azure Functions?

How to run Headless Chrome in Azure Cloud Service or Azure Functions?


By : Babis Mylonas
Date : March 29 2020, 07:55 AM
it should still fix some issue I would recommend to use https://www.browserless.io/ so you don't have to run the chrome.exe in the app service.
Replace puppeteer.launch with puppeteer.connect
code :
const browser = await puppeteer.connect({
  browserWSEndpoint: 'wss://chrome.browserless.io/'
});
Headless browser image quality - Headless chrome, phantom js, slimmer js

Headless browser image quality - Headless chrome, phantom js, slimmer js


By : Khel Decherong
Date : September 20 2020, 06:00 PM
Any of those help You will get better results setting the deviceScaleFactor to 2 (a.k.a emulate retina):
code :
(async () => {
    const browser = await puppeteer.launch({ headless: false })
    const page = await browser.newPage();
    await page.setViewport({width: 800, height: 800, deviceScaleFactor: 2});
    await page.goto('https://en.wikipedia.org/wiki/Main_Page')

    await page.screenshot({ fullPage: true, path: 'test.png' })
})();
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