Simple PHP server to demonstrate how Code RGV's always right URL works
./server
curl -L http://localhost:8000 # no response curl -L http://localhost:8000/rsvp # should redirect
Modify index.php based off of the Spreadsheet and the Google Apps Script
You can add a onEdit callback on your spreadsheet that calls your /update on your server.
curl -L http://localhost:8000/update