What would be the best (Lazarus/Freepascal) way to push data to a web page?

I would like a cgi-bin application that sends updates to the client browser telling of things like:
- display the modification time of a file on the server
- display statistics of items from the server side without having the user refresh the web page on their browser.

I'm not sure if fcl-web can do that.

I think that the terminology is:
Ajax Push
Reverse Ajax
Two-way-web
HTTP Streaming
HTTP server push
WebSockets

Can anyone point me in the right direction?

Thanks,
Anthony