server {
  listen 8443;
  server_name _;

  root /usr/share/nginx/html;
  index index.html;

  location /api/ {
    # preserve the original URI (/api/...) when proxying
    proxy_pass http://backend:4000;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection 'upgrade';
    proxy_set_header Host $host;
    proxy_cache_bypass $http_upgrade;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_buffering off;
    chunked_transfer_encoding off;
  }

  location / {
    try_files $uri $uri/ /index.html;
  }
}