Node.js Programmable HTTP Proxy

proxy-chain is a Node.js library that provides a programmable HTTP/SOCKS proxy server with extensive features. It supports SSL/TLS, authentication, upstream proxy chaining, and protocol tunneling, enabling dynamic and custom configurations. Key differentiators include its utility for headless browsers like Puppeteer and Playwright, which struggle with authenticated proxy URLs, by providing a local proxy that handles authentication. The library also offers traffic statistics and custom HTTP response capabilities. Developed by Apify, it's a core component in their web scraping platform and is used by Crawlee. The current stable version is 2.7.1, with minor and patch releases occurring frequently, typically on a monthly basis.