1410357 - Network monitor does not capture requests made by extensions

Status: RESOLVED DUPLICATE of bug 1642784

(DevTools :: Netmonitor, defect, P3)

Description

[61.1p57]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0
Build ID: 20171019222141

Steps to reproduce:

--- manifest.json ---
{
  "name": "Request",
  "version": "0.1",
  "manifest_version": 2,
  "permissions": [
    "https://example.com/"
  ],
  "background": {
    "scripts": ["background.js"]
  }
}

--- background.js ---
const request = new XMLHttpRequest();
request.open('GET', 'https://example.com/', true);
request.onload = function () {
    if (this.status >= 200 && this.status < 400)
        console.log("response received.")
};
request.send();

Load the demo above and open debug window.


Actual results:

"response received." appears in console, but nothing shows up in network monitor.


Expected results:

The request to https://example.com/ should be recorded.

Comment 1

[Jan Honza Odvarko [:Honza] (always need-info? me)]

The Network monitor is primarily used to monitor HTTP traffic related to the current page/browser tab. If I understand correctly background.js is not attached to any particular page, correct?

You might use the Browser Toolbox...
Do you see the request there?


Honza

Comment 2

[61.1p57]

According to the devtool, it's attached to a _generated_background_page.html page.

The browser toolbox does show the request though, ok for a workaround but still creates inconveniences.

Comment 3

[Will Elwood (:Will)]

Since it's not explicit in the STR and in case there's confusion that has stalled this, I think "Load the demo above and open debug window." is referring to about:debugging and the devtools that open from there that are specifically for debugging an addon (not "the current page/browser tab").

If the netmonitor is not supposed to work in this context, perhaps consider hiding the Network tab so addon devs don't assume they can rely on it?

Comment 4

[Pierre-Adrien]

I noticed the same issue today, and was really surprised by the behaviour as well. I had the same behaviour when sending the request from a background script, and same thing with requests sent from a browser action popup. I would have assumed all requests sent from an addon to be visible from the "debug" toolbox Network Tab of this addon, but they aren't.

I found this really off-putting. Is this behaviour intended?

Comment 5

[Jan Honza Odvarko [:Honza] (always need-info? me)]

I did more testing in bug 1642784 and it seems to be working for me. I can see HTTP requests coming from the backround scope in the Browser Toolbox's Network panel

Closing this as duplicate, but please ping me if you have a test case that can be used to reproduce the issue.

Honza