Fiddler Tutorials & Guides

Learn how to capture traffic from specific domains in Fiddler — including HTTPS decryption, host filtering, CustomRules.js, and troubleshooting tips for HTTP debugging.

Learn how to test GraphQL APIs using Fiddler: capture, inspect, modify, and replay queries with HTTPS decryption, AutoResponder, and Composer. A practical fiddler tutorial for developers and QA engineers.

Step-by-step guide to configure Fiddler as system proxy for full HTTP/HTTPS traffic inspection, including HTTPS decryption, troubleshooting, and cross-tool validation.

A complete, step-by-step Fiddler tutorial for decrypting HTTPS traffic — covering certificate trust, mobile setup, troubleshooting, and TLS 1.3 support.

Learn how to integrate Fiddler with Selenium WebDriver for real-time HTTP debugging, HTTPS decryption, and automated API validation — a must-know fiddler tutorial for QA engineers.

Learn how to read and interpret Fiddler's Timeline and Waterfall charts for HTTP debugging, performance analysis, and HTTPS decryption validation.

Step-by-step Fiddler tutorial for iOS mobile app debugging: configure proxy, install & trust certificates, handle HTTPS decryption, and troubleshoot common issues.

Step-by-step guide to install Fiddler Classic and Fiddler Everywhere on Windows 11 in 2026 — including HTTPS decryption, firewall config, and troubleshooting.

Master API endpoint testing with Fiddler Composer: step-by-step guide covering HTTPS decryption, auth headers, multipart forms, and real-world debugging for developers and QA engineers.

Learn how to establish reliable HTTP(S) performance baselines and compare before/after changes using Fiddler’s inspectors, timings, and SAZ analysis tools.