gistfile1.txt

upstream api { 
    server 127.0.0.1:3030;          # Works fine
    # server librecms-api.jit.su:80;  # Does not work
    #server zdwolfe.net:3030;          # Works fine
}

server {
  listen 80;
  server_name localhost;
  access_log /var/log/nginx/librecms.access.log;
  error_log /var/log/nginx/librecms.error.log;
  root /var/www/librecms/src/angular/app;

  underscores_in_headers on;
  location /api/ {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $host;
    proxy_set_header X-NginX-Proxy true;
    proxy_pass http://api/;
    proxy_redirect off;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
  }

  location / {
    index index.html;
  }
}