devtools.network APIs fail on first open of DevTools

[jethron]

In an extension using a custom devtools panel in MS Edge 142.0.3595.65, calling chrome.devtools.network.getHAR() produces/logs a Permission Denied error object instead of a HAR object:

{"code":"E_FAILED","description":"Operation failed: %s","details":["Permission denied"],"isError":true}

chrome.devtools.network.onRequestFinished.addListener also fails.

Closing/reopening DevTools and reopening the custom panel resolves the issue and the APIs then work properly, until Edge itself is restarted, where the first run of DevTools and opening the panel reverts to the failure state until DevTools is restarted again. The same occurs when loading the extension as unpacked.

With the same extension in Chromium, Chrome, and Firefox, the devtools.network APIs work straight away without needing a restart. No documentation I can find for these API says they can fail or require any permissions that could be denied.

[Rahul-Bauri]

Hi @jethron Thank you for reporting this bug. We’ll investigate further and notify the engineering team so they can work on a resolution. In the meantime, could you please share the steps to reproduce the issue along with a sample extension where you encountered it?

[jethron]

Thanks @Rahul-Bauri!

I'll note that I have since tested on a Windows machine with Edge 142.0.3595.76 and didn't replicate the issue, so this may have already been fixed in the builds between *.65 and *.76, but user reports are from macOS and I was able to replicate on Linux where I guess *.65 is still the latest version, unless it's a platform issue.

Minimal test case attached: testhar.zip

1. Unzip file
2. Restart Edge
3. Load dist folder as unpacked extension
4. Go to a web page
5. Right click > inspect to open DevTools
6. Go to new TestHar tab
7. Page text should become the getHAR() result showing error object with red background
8. Close dev tools
9. Right click > inspect to open DevTools
10. Go to TestHar tab again
11. Page text should become the getHAR() result showing an actual HAR file with green background
12. Goto 2

Don't think it matters but the production extension is https://chromewebstore.google.com/detail/snowplow-inspector/maplkdomeamdlngconidoefjpogkmljm?hl=en (repo https://github.com/snowplow/chrome-snowplow-inspector)

[Rahul-Bauri]

@jethron Thank you for providing the steps and details so clearly. This will be very helpful in resolving the issue efficiently. I’ll share an update here as soon as I receive any information from the internal team.

[jethron]

Today Edge updated to 142.0.3595.80 and the issue now seems to have been resolved, I can no longer replicate the issue.

Thanks for your time @Rahul-Bauri!