Hi, I suppose to have an issue with nginx config on related docker image. I found this one as explanation of the problem:

https://stackoverflow.com/questions/38346847/nginx-docker-container-502-bad-gateway-response

I understand the problem but I can't resolve it, I always receive bad gateway response.
I attached my nginx.conf so you can read it. Hoping to fix soon because are too days I'm on the issue. If that's ok, I'll take a look on docker-compose file. Thanks mates!