Change response in Chrome extension

Question

I'm currently developing a Chrome extension. I only don't understand if/how I can change a response body in Chrome.

Example: A website does an XMLhttpRequest to example.com/is_logged_in.php. This returns 0. I want to make a script that auto changes the 0 to an 1. And not by changing the javascript that makes the call, but by changing the response body, so the javascript thinks it recieved a 1.

I know you can change the response headers with chrome.webRequest but I want to change the response body, not the response headers.

It's currently possible by changing your hosts file so example.com 'redirects' to your own hosting. Then you create is_logged_in.php and set the content to 1. The script then thinks the user is logged in. I have checked it, and this works. But now I want this in a Chrome extension so it is more user friendly.

Can Chrome change a response (body, not its headers) and if so, how?

Answer 1

According to this active chromium issue you cannot for now modify the response body in a JavaScript extension.

If you really want to do that, a possible way could be using NPAPI Plugins, but unfortunately it's not an option in my case because of the security issues.