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Charles is a web debugging proxy that runs locally on Windows, macOS and Linux. It records and displays the HTTP and HTTPS data exchanged between your browser or other applications and the internet, including requests, responses and headers.

Whistle is a cross-platform network debugging proxy that captures traffic over protocols such as HTTP, HTTPS, HTTP/2, and WebSocket, and lets you modify requests and responses with rules. It comes in two versions: a desktop client and a command-line tool.