I need the simplest web server to write a minimal web interface for an application. It should be something really featureless like Webrick from Ruby's standard library or BaseHTTPServer from Python's standard library, just a way to keep a server listening to a port and respond to GET requests with a string.
Thanks
Try NanoHTTPD. I have been using it for Android development.
NanoHTTPD is a light-weight HTTP server designed for embedding in other applications, released under a Modified BSD licence.