Fiddler Tutorials & Guides

Learn how to capture, decrypt, and analyze HTTP/2 and HTTP/3 traffic in Fiddler Classic and Fiddler Everywhere — with step-by-step setup, troubleshooting, and real-world examples.

Learn how to bypass iOS certificate pinning using Fiddler proxy for secure, ethical HTTP debugging and HTTPS decryption on real devices.

A hands-on fiddler tutorial for beginners: install Fiddler, capture HTTP/HTTPS traffic, enable https decryption, filter sessions, and troubleshoot common issues.

Learn how to automate API tests using Fiddler Classic’s AutoResponder, FiddlerScript, and HTTPS decryption — no external tools required. Practical, step-by-step guide for developers and testers.

Learn how to integrate Fiddler with Selenium WebDriver for real-time HTTP debugging, HTTPS decryption, and API visibility in automated tests.

Learn how to write production-ready Fiddler extensions in C# — from context menus and inspectors to HTTPS decryption handling and auto-responder rules.

Learn how to build production-ready custom Fiddler inspectors for JWT, Protobuf, GraphQL, and more — with step-by-step C# code, troubleshooting tips, and HTTPS decryption safety checks.

A hands-on FiddlerScript tutorial for developers: customize your Fiddler proxy behavior with real-world C# examples for request rewriting, HTTPS decryption, and automated HTTP debugging.

Learn how to read Fiddler's Timeline and Waterfall charts to diagnose HTTP performance bottlenecks, interpret SSL negotiation, TTFB, and caching behavior — with step-by-step examples.

Learn how to export Fiddler sessions as SAZ, HAR, and raw files for performance analysis, collaboration, and automation — with pro tips and troubleshooting.