nginx.conf

upstream nodejs {
  server web:4201;
}

server {
  listen 80;

  # Enable sending precompressed ".gz" versions of static files if such exist.
  # The precompressed files are created when the app is built.
  # https://nginx.org/en/docs/http/ngx_http_gzip_static_module.html
  gzip_static on;
  # Configure compression of proxied requests.
  # https://nginx.org/en/docs/http/ngx_http_gzip_module.html#gzip_proxied
  gzip_proxied no-cache no-store private expired auth;

  # Uncomment the gzip directives below to enable on-the-fly gzip compression
  # of html dynamically generated by server-side rendering. Enabling will
  # increase server load, but significantly reduce the size of transfered html
  # files, even on the lowest compression level (1).
  # https://nginx.org/en/docs/http/ngx_http_gzip_module.html
  #gzip on;
  #gzip_comp_level 1;
  #gzip_types text/html;

  root /static;

  location / {
    try_files $uri sv/$uri @backend;
  }

  location @backend {
    proxy_pass http://nodejs;

    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_http_version 1.1;
    proxy_set_header X-NginX-Proxy true;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_cache_bypass $http_upgrade;
    proxy_redirect off;
    proxy_set_header X-Forwarded-Proto $scheme;
  }
}