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Zan Proxy is an HTTP proxy server written in Node.js, which can be used to modify requests and mock response data. It is also a tool for custom DNS resolving and request monitoring. The proxy server can be easily configured by a user-friendly interface. In addition, a mechanism is provided for developers to customize the behavior of the server.
Netgraph is a packet sniffer tool that captures all HTTP requests/responses, and displays them in a web page. You can run Netgraph in your Linux server without a desktop environment installed, and monitor HTTP requests/responses in your laptop's browser.