Build a Custom Inspector

1. Create a Fiddler Classic extension project.

2. Change the code to derive from the Inspector2 class and implement either IResponseInspector2 or IRequestInspector2.

   using Fiddler;
   
   [assembly: Fiddler.RequiredVersion("2.3.0.0")]
   
   public class WebViewer: Inspector2, IResponseInspector2
   {
       public WebViewer()
       {
       //
       // TODO: Add constructor logic here
       //
       }
   }
   

3. Inside the class, create a new method. By typing public override, you'll get an autocomplete list of the methods you need to write.

4. In Solution Explorer, right-click on the project and click Add > User Control.

5. Use the Toolbox to add controls to your user control. These will show the data about the HTTP message under inspection.

6. In the body{ set } and headers{ set } properties, you should update your control's visual representation of the request or response.

7. Compile and load your extension in Fiddler.