Flask localhost refused to connect error

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I am using an online IDE to test a flask project, but whatever I do, I get a web page that gives localhost refused to connect error. It happens when I submit a form, and it is supposed to redirect to another page. Further more, I tried to run this on another online IDE, but still the same error. What could be wrong?

What I have tried:

I did everything right, setting host to 0.0.0.0, I tried every port from port 8000, port 8080 and port 5000. I even adjusted windows firewall settings to allow port 8000. I added if __name__ == '__main__': to app.run() but it still doesn't work.
Here is the code in question: https://replit.com/@roberttattorn/FlaskProject#main.py

Posted 23-Dec-21 0:27am

Member 13969713

Updated 24-Dec-21 12:14pm

Richard MacCutchan

v2

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Richard MacCutchan 23-Dec-21 7:37am

I do not think you can run using localhost via an online ide. You should install flask on your local system to test it properly.

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Member 13969713 · Accepted Answer · 2021-12-24T12:14:00

Solution 1

Well, I found a solution to this. It turned out, that the url provided in the form action section >http://localhost:8000/result should instead be /result so that it's a relative address instead of an absolute address.

Posted 24-Dec-21 12:14pm

Member 13969713

Updated 24-Dec-21 12:15pm

v2