Using Fiddler as proxy in .NET app.config

In this post we will setup Fiddler as a local proxy for a .net app, it is simple, yet very handy for debugging.

What is Fiddler?

Fiddler is a Web Debugging Proxy which logs all HTTP(S) traffic between your computer and the Internet. Fiddler allows you to inspect traffic, set breakpoints, and “fiddle” with incoming or outgoing data.

Download Fiddler

You need to download Fiddler and install it.

Setting your .NET app to use Fiddler

Add this section on configuration to your app.config


Once Fiddler is running it will proxy all traffic for the app.


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Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning hands down.