Graceful HTTP Server Shutdown

This `http-close` package for Node.js provides a mechanism to gracefully shut down an HTTP server by managing open TCP sockets. Currently at version 1.0.0, it appears to be a stable utility, likely in maintenance mode given its focused scope and the absence of rapid version increments. It differentiates itself by intelligently handling various socket states during `server.close()`: it destroys keep-alive sockets without active responses, sends `Connection: close` headers for requests where headers haven't been sent, and applies a configurable timeout (default 5 seconds) to pending connections. If a socket times out after `server.close()` has been called, the module intervenes to respond with a 500 status code before ending the connection for requests with unsent headers, and forcefully destroys all other remaining sockets. This ensures a clean exit for the server process, mitigating the common issue of hanging connections during shutdown.