Fiddler is a web debugging proxy tool for Windows, macOS and Linux. It has evolved from Fiddler Classic into a more robust and versatile product - Fiddler Everywhere. Fiddler Classic is a web debugging proxy tool designed to capture, inspect, and modify HTTP and HTTPS traffic between a client application and external services. It operates as a local proxy server, … Fiddler is a free Web Debugging Proxy which logs all HTTP (S) traffic between your computer and the Internet.

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Want to have Fiddler automatically rewrite requests and responses, add or remove headers, or flag/ignore sessions based on rules you specify? Check out the FiddlerScript Cookbook.

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