Headless Chrome Javascript API/headless_shell questions

[Deepak Kumar]

Hi! 

I successfully built the headless_shell application, and it works like a charm. I'm brand new to headless browsing in general, but had a few questions based on my experiences w/ PhantomJS and some things I've been trying with headless_shell.

1. Is there a list of headless_shell command line inputs documented somewhere? I looked around at different pieces of documentation and have found some things (for example, --dump-dom and --screenshot), but can't seem to find any information about general headless_shell usage.

2. In using PhantomJS, there is a very easy plug and play Javascript API which utilizes the underlying library 

For example (from their homepage):

page = require('webpage').create()
page.open("https://www.google.com", function(status){
    //do something
    phantom.exit()
})

Is there something similar for headless chrome yet? And if so, is there documentation on how it all works?

Thanks for your time.

[Salvador Faria]

Did a build of headless_shell today hehe.

Looking to see if there is any way i could use headless_shell to save HAR files.

[Paul Irish]

The primary api of headless is via the chrome debugging protocol.

• Chrome Debugging Protocol
  
• Chrome Debugging Protocol Viewer
  

cyrus-and/chrome-remote-interface provides a nice nodejs based API to start working with the protocol, and in fact... The same author created cyrus-and/chrome-har-capturer which will capture network activity and generate a HAR from it. :)

Here's a basic load-a-page-and-take-a-screenshot example: headless-snap/index.js

Also, I would recommend reading these two guides as background:

• Building and Using Headless Chrome FTW by samsaccone
  
• Chrome Headless build  by zackarychapple
  

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[Deepak Kumar]

Appreciate it! 

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[Sami Kyostila]

Thanks Paul! One more tip: see headless_shell_switches.cc for the supported command line options.

- Sami

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[Deepak Kumar]

Hi Paul,

Thanks a lot. Do you know if headless currently supports modification of the user-agent string? There is an API call in Chrome Debugging Protocol (Network.setUserAgentOverride()) but it doesn't seem to have an effect.

Cheers,

Deepak

On Wednesday, September 7, 2016 at 9:13:39 PM UTC-5, Paul Irish wrote:

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[Paul Irish]

Yes. Use that method but call Network.enable first. :)

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[Deepak Kumar]

Hey Paul,

Thanks again for all your help. I'm using the example Javascript that takes a screenshot as a model for this user-agent modification, which I'm linking here: https://jsfiddle.net/qx7o4gue/

If you have the time for a quick spot check, is there something immediate that you can see where I'm going wrong? I'm calling the function after Network.enable().

Thanks a ton.

Deepak

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[Deepak Kumar]

Nevermind, apparently I don't know anything about Javascript. Thanks again!