User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:105.0) Gecko/20100101 Firefox/105.0

Steps to reproduce:

Opened 'Web Developer Tools' and selected the 'Network' tab

Loaded
https://www.swpc.noaa.gov/products/goes-magnetometer

Selected
https://services.swpc.noaa.gov/json/goes/secondary/magnetometers-3-day.json
in the 'Web Developer Tools' window.

Selected the 'Response' tab that appeared.

Actual results:

The window that appeared when selecting the 'Response' tab showed
"No response data available for this request"
for several seconds, before displaying the actual available data.

Expected results:

"Fomatting the data"
or something similar should be shown while the data is being formatted.

The Bugbug bot thinks this bug should belong to the 'DevTools::Netmonitor' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Thank you for the report!

I can reproduce this on my machine (Win10, Fx Nightly). The JSON resposne is relatively big and the Response panel takes time to render the "Tree".

I agree there could be some UI showing a message or animated throbber to indicate the work is in progress.

I have noticed that the "No response data available for this request" message is shown every first time any response data is presented in the "request details" window.

This can be easily seen when selecting a response and scrolling down the list of requests.

Maybe the proper temporary message – something like "Formatting the data" – could be shown only when the response is larger than a certain size.