Just the flask server version of wonderful @mattt's https://github.com/mattt/GroundControl/ Just add a procfile and maybe gunicorn. Enjoy! ;)

server.py

from flask import Flask
from plistlib import writePlistToString
app = Flask(__name__)

@app.route("/")
def default_plist(): 
    plist_content = {
      'Greeting' : "Hello, World",
      'Price' : 4.20,
      'FeatureXIsLaunched' : True
    }
    return writePlistToString(plist_content)

if __name__ == "__main__":
    app.run()