Fiddler Everywhere

Fiddler is a network analysis tool useful for capturing and understanding network activity. The Beta version is compatible with Linux systems, making it accessible to a wider range of developers and testers.

Installation Steps

1. Download Fiddler Everywhere Beta from Telerik
2. Open terminal and navigate to the download directory
3. Execute the command to make the file executable:

chmod a+x progress-telerik-fiddler.AppImage

Launching the Application

Launch Fiddler by opening a terminal, navigating to the file location, and running:

./progress-telerik-fiddler.AppImage

The interface features automatic traffic capture by default.

Interface Features

Inspectors Tab

• Left panel: Displays captured traffic
• Right panel: Shows request details
• Bottom bar: Contains Capture/Capturing toggle

Composer Tab

• Top section: For building HTTP requests (URL, headers, body)
• HTTP version selection: Choose between HTTP versions
• Execute button: Send the request
• Bottom panel: Displays response data

Example request format:

GET http://www.example.com HTTP/1.1
User-Agent: Fiddler

Key Capabilities

Fiddler Everywhere allows you to:

• Capture and inspect HTTP/HTTPS traffic
• Build and send custom requests
• Analyze request and response headers
• Debug API calls
• Inject custom data for testing purposes

Conclusion

Fiddler is a valuable utility for analyzing data flow and injecting custom data for testing purposes. Its cross-platform availability through the AppImage format makes it particularly useful for Linux users working on network debugging and API testing.