Deploying a minimal flask app in docker – server connection issues

The problem is you are only binding to the localhost interface, you should be binding to 0.0.0.0 if you want the container to be accessible from outside. If you change:

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

to

if __name__ == '__main__':
    app.run(host="0.0.0.0")

It should work.

Note that this will bind to all interfaces on the host, which may in some circumstances be a security risk – see https://stackoverflow.com/a/58138250/4332 for more information on binding to a specific interface.

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