Update app.py

app.py

@@ -221,6 +221,9 @@ class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):
                 'session_code': session_code
             }
 
+            if 'replyTo' in data:
+                broadcast_message['replyTo'] = data['replyTo']
+
             for cid in sessions[session_code]['clients']:
                 if cid in clients and cid != client_id:
                     try: