How to control flowgraph variables from a Webserver?

[ndc85430]

Is that possible?

Of course it is and sounds no different from any other kind of web app really. The form on the page needs to be submitted to the server, which will read the data from the request and do whatever you need to with it. Have you looked at the documentation for SimpleHTTPRequestHandler to see how you get access to the form data in a request? I can't say I know; I've only used Flask for web apps in Python.