Netgraph is a packet sniffer tool that captures all HTTP requests/responses, and displays them in a web page. You can run Netgraph in your Linux server without a desktop environment installed, and monitor HTTP requests/responses in your laptop's browser.
Nano Servlet Engine is a really small-sized HTTP server (with Java Servlets(TM) support in the future). Due to its size (100kb) it's possible to use it on mobile devices with a Java runtime environment.