Use Fiddler to inspect query sent to find

I am trying to use Fiddler to track the  queries sent to Find. I added the web.config setting to use a proxy as well. But I get an error when I set the proxy: The remote server returned an error: (400) Bad Request. 

Any Idea how I can overcome this, or how do I use Fiddler to track the queries to Find. I have read a bunch of articles here and they mention to use a proxy. Below is one of them I read:

https://world.episerver.com/Modules/Forum/Pages/Thread.aspx?id=147074