Bitlash (http://bitlash.net) comes with a web server example that may be helpful:
For a short response like a sensor reading you can define a Bitlash function to return a response to the invoking browser or server. There's a built-in, password-protected telnet server that allows you to log in remotely and use Bitlash to make changes like this.
For longer responses you can compile in pages with arbitrary HTML and embedded Bitlash code which is executed when the page is rendered.