Many websites are utilizing Cowboy as the HTTP Web server and Express JS as the Web application server. They typically have their HTTP header set to Cowboy for the server, with the X-Powered-By HTTP header indicating Express. One example is
This setup raises questions about why this combination is used. What is the advantage of using Cowboy as the HTTP Web server in conjunction with Express? And how can one start implementing Cowboy as an HTTP web server while also utilizing Express effectively together?