HTTP request - Response was a server error. what does this mean?

Question

i am trying to debug and issue and while examining HTTP request in Fiddler i noticed one of the request with a red triangle sign next to it with no HTTP response. Can someone explain what does it mean? is there an issue on our end or the server where the request was sent?

TIA

Answer 1

The trace file you sent me shows that you've exported the traffic from IE's F12 Developer Tools Network tab, rather than capturing it with Fiddler itself. You then imported that traffic into Fiddler.

The problem is that the IE developer tools have a number of bugs and in this case they've omitted some of the request data. As a consequence, Fiddler shows only the data it finds and omits the missing data.

To get a proper capture, your best bet is to use Fiddler itself rather than the F12 tools.