Fix flask setup hosted on Centos7/nginx

I have a flask application written that can be run on localhost. I have also setup aws internal subnets with gateway to public internet. However, i cannot configure the nginx/gunicorn or uwsgi such that the flask app can work. It needs server block set up and the problem right now is it keeps getting bad gateway error. For successful candidate, i will provide the flask script, the [login to view URL] and related network setup info, the deliverables are expected to be the necessary files such as [login to view URL] etc and possibly advice on how to configure the server and network such that the flask app works.