AWS beanstalk 上的 Python Flask 给出 502 网关错误

Question

My Pyhon Flask app is set to listen on port 5000 when deployed to AWS beanstalk. The app starts successfully. But when I try to access it. It gives 502 gateway error. Then I downloaded full log and check the nginx log, and found out it is actually forwarding request to port 8000. So I changed my app to listen on port 8000 and deployed again. Now the app failed to start, and in the log it has the error address already in use. Anybody having the same problem? Any help would be appreciated.

Answer 1

OK, finally found out the problem. you will have to have if name == " main ": wrap your app.run()

Not working:

app.run()

Fixed:

if __name__ == "__main__":
    app.run()