Apac2 + Cloudflare 502 Error On Static Files

Question

I try to setup my nodejs application on ubuntu 16. I configure apach2 like that;

I'm getting Error 502:Bad gateway from cloudflare. I did not do any config on cloudflare. What should ı do? Server is running because I can go this url; https://myapp/ Bu assets not loading 502 Url : https://myapp/assets/css/style.bundle.css

Answer 1

I solved with add / after ProxyPass like that; ProxyPass / http://localhost:8081/