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cloud - Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch when building a streamlit web app on Heroku

I was building a web application on Heroku and encountered this issue:

2020-10-24T03:56:57.857273+00:00 app[web.1]: You can now view your Streamlit app in your browser.
2020-10-24T03:56:57.857320+00:00 app[web.1]: 
2020-10-24T03:56:57.857675+00:00 app[web.1]: Network URL: http://172.17.131.6:8501
2020-10-24T03:56:57.857819+00:00 app[web.1]: External URL: http://34.202.9.122:8501
2020-10-24T03:56:57.857932+00:00 app[web.1]: 
2020-10-24T03:56:59.458188+00:00 app[web.1]: 2020-10-24 03:56:59.458 Generating new fontManager, this may take some time...
2020-10-24T03:57:41.000000+00:00 app[api]: Build succeeded

2020-10-24T03:57:52.127634+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2020-10-24T03:57:52.147741+00:00 heroku[web.1]: Stopping process with SIGKILL
2020-10-24T03:57:52.252583+00:00 heroku[web.1]: Process exited with status 137
2020-10-24T03:57:52.301275+00:00 heroku[web.1]: State changed from starting to crashed
2020-10-24T03:57:53.705631+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=okc-thunder-rebounds.herokuapp.com request_id=a90bb347-f583-4bec-8a6c-37bfea93908e fwd="71.232.30.113" dyno= connect= service= status=503 bytes= protocol=https

My setup.sh is like:

mkdir -p ~/.streamlit/
  
echo "
[general]

email = "[email protected]"

" > ~/.streamlit/credentials.toml

echo "
[server]

headless = true

enableCORS=false

port = $PORT

" > ~/.streamlit/config.toml

And my Procfile is like:

web: sh setup.sh && streamlit run rebound_app.py

Where does it go wrong?

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1 Answer

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The application must bind to the port provided by Heroku via the $PORT env variable. This is a requirement for every Web Dyno.

You need to pass the $PORT to streamlit

echo PORT $PORT
streamlit run  --server.port $PORT rebound_app.py

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