Problems with flask and bad request
I had the same error as yours.
My flask server was installed inside respberry-pi and I was trying to access it using https://ip:5000.
The problem was I was using https instead of http.
When I changed it to http://ip:5000, it worked.
Recently I also faced this, the problem came from the SSL config on my app.In my .env I set the SSL_DISABLE to False, then I change it to True.
change SSL_DISABLE=False to SSL_DISABLE=True
So, the point here is are: check your URL, maybe be it something like: https://127.0.0.1:5000, just change it to http://127.0.0.1:5000.
Hope it helps to someone who also facing this issue in the future.