prepare for anwser: https://stackoverflow.com/questions/29461028/flask-rabbitmq-socketio-forwarding-messages

my code running environment:

• OS: ubuntu 16.04 LTS
• Python: 3.5.2
• pip: 9.0.1

file description:

├── requirements.txt      -- packages list file (i use latest version)
├── run_bad.py            -- incorrect example
├── run.py                -- correct example
├── sio_client.py         -- socket.io client call
├── sio_server.py         -- cocket.io server call
├── task_client.py        -- a udp client wrapper
└── task_server.py        -- a udp server wrapper

setup & run

pip install -r requirements.txt
# one terminal window 
python run.py
# another terminal window
python task_server.py

look result

1. open web browser, open http://127.0.0.1:5000/, we named this tab as tab1
2. and, press F12 to open dev tool, and switch to console panel
3. open another tab and open http://127.0.0.1:5000/task?msg=hello, we named this tab as tab2
4. look at the console panel at tab1, you could see some output

ps

run_bad.py is an incorrect example Design ideas:

-> GET /task (Browser=>Server)(http req1)
    -> socket.io\[write_task_log\] (Client=>Server) (ws req2)
        -> socket.io\[send_log\] (Server=>Browser) (ws req3)

ideas is ok, but, server is Single Process and Single Thread, so when req2 created, req1 isn't completed, then req1 wait req2 finish, but req2 wait response from server, where is blocking at there now. so that, i need to create a external service to send request for req2, and udp connect request will immediately finish after send data, so req1 will finish soon. req2 can get server's response as expected, all is ok.