Deploy Flask socketio on Linode

Hello Linode community.
I developed a flask web application on my local host. The application includes chatroom functionality which I implemented using flask-socketio. The application works fine on localhost. Last week I deployed my flask application on Linode and socket functionality is not working.
Here are the configuration diff between my localhost and Linode:

1. In Linode, I don't use the following command "socketio.run(app,host="0.0.0.0",allow_unsafe_werkzeug=True,debug=True, use_reloader=False)". Instead, I added "import run" to init__.py file. (the socketio.run command is in the __main of run.py).

2. I configure nginx file as follow:
   *server {
   listen 80;
   server_name 172.232.56.254;

   location / {
   proxy_pass http://127.0.0.1:8000;
   proxy_set_header Host $host;
   proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
   }

   location /socket.io {
   include proxy_params;
   proxy_http_version 1.1;
   proxy_buffering off;
   proxy_set_header Upgrade $http_upgrade;
   proxy_set_header Connection "Upgrade";
   proxy_pass http://127.0.0.1:5000/socket.io;
   }
   }*

When I load the application I don't get errors on the server side. But on my client I get 502 bad gateway.
Example:
Request URL: http://172.232.56.254/socket.io/?EIO=4&transport=polling&t=OeNgJ4M Request Method: GET Status Code: 502 Bad Gateway Remote Address: 172.232.56.254:80 Referrer Policy: strict-origin-when-cross-origin

Any idea how to fix this?

Tomer