...Its high-level proxy-agent package automatically selects the correct agent from standard environment variables such as HTTP_PROXY, HTTPS_PROXY, and NO_PROXY. Lower-level packages provide dedicated support for HTTP, HTTPS, SOCKS, and PAC-based proxy configurations. An LRU cache reuses compatible agent instances across requests to reduce repeated setup work. The repository also includes shared foundations, URI helpers, PAC resolution utilities, negotiation code, tests, and TypeScript configuration. Applications can use the main package as a drop-in Node HTTP agent or import a protocol-specific module for greater control. ...