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Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
prism.js - Prism is a lightweight, extensible syntax highlighter, built with modern web standards in mind.
httpbin(1) - HTTP request and response service
highlight.js - Highlight.js is a syntax highlighter written in JavaScript. It works in the browser as well as on the server.
HTTP Toolkit - Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.
Bright - React Server Component for syntax highlighting.