Fiddler Tutorials & Guides

Step-by-step guide to capturing and decrypting HTTPS traffic from Android apps using Fiddler — including certificate installation, pinning bypass, and real-world troubleshooting.

Learn practical Fiddler request body editing techniques: manual inspectors, Composer, AutoResponder, FiddlerScript, and breakpoints — with real-world examples and troubleshooting.

Fiddler slowing your internet? Discover 6 proven causes — from HTTPS decryption overhead to aggressive AutoResponder rules — and step-by-step fixes to restore speed without losing debugging power.

A hands-on, beginner-friendly walkthrough of every Fiddler Classic interface section — from session list to HTTPS decryption, with practical examples and troubleshooting tips.

Step-by-step guide to installing and trusting the Fiddler Root Certificate on Windows and macOS for reliable HTTPS decryption and fiddler debugging.

Learn how to use Fiddler for real-world website speed optimization: HTTPS decryption, waterfall analysis, caching audits, and live response mocking — all in one practical fiddler debugging guide.

Learn how to capture, decode, and debug WebSocket traffic in Fiddler — including wss:// decryption, frame analysis, filtering, and troubleshooting tips for developers.

Learn how to test API rate limiting with Fiddler: HTTPS decryption, burst simulation, AutoResponder 429 injection, and scripted validation for robust API testing.

Fiddler can't decrypt HTTPS traffic due to certificate trust issues, TLS mismatches, certificate pinning, or proxy misconfigurations. This fiddler tutorial explains why—and how to fix each cause.

Master advanced AutoResponder regex patterns in Fiddler for precise HTTP debugging, dynamic API mocking, and secure HTTPS decryption workflows.