A great exercise for Web developers is to build a minimal web-server. You can choose your definition of 'minimal' but essentially it should receive some request and return a response (from and to a web browser). As a webdev I found even the very, very minimal web server in Land of Lisp to be really insightful to build. If you wanted to flesh out the actual handling of http verbs better that would be even more awesome. Minimal webservers should be the minimal lisps of web developers