Fiddler Tutorials & Guides

Learn how to use Fiddler Composer to build, send, and debug custom HTTP requests — with headers, JSON bodies, auth tokens, multipart uploads, and HTTPS decryption support.

Master Fiddler sessions and inspectors to decode HTTP(S) traffic, debug APIs, and validate security headers — a practical guide for developers and testers.

Master Fiddler's Statistics tab: decode HTTP timing, size, compression, and protocol metrics for real-world performance analysis and debugging.

Step-by-step solutions for Fiddler certificate trust errors — including Windows, macOS, iOS, Firefox, and CI/CD fixes for reliable https decryption and fiddler debugging.

Step-by-step guide to capturing HTTPS traffic in Fiddler 2026 — including certificate trust, mobile setup, filtering, and troubleshooting for fiddler debugging and http debugging.

Fix Fiddler not working with Chrome: resolve HTTPS decryption failures, localhost bypass, certificate trust, and proxy misconfigurations for reliable HTTP debugging.

Learn how to automate API tests using Fiddler's AutoResponder, Custom Rules, Composer, and HTTPS decryption — a practical guide for developers and QA engineers.

Struggling with Fiddler HTTPS decryption? This tutorial delivers 6 proven fixes—from certificate trust issues to TLS version mismatches and corporate policy blocks.

Master Fiddler's SAZ file format: parse, modify, and automate HTTP(S) captures programmatically. Includes C#, Python, FiddlerCore, and HTTPS decryption tips.

A step-by-step Fiddler setup guide covering proxy configuration, HTTPS decryption, localhost capture, and troubleshooting for first-time users.