Setting up nginx with Contao 4

server {
  listen 80;
  server_name www.foo.com;

  root /var/www/www.foo.com/web;

  #
  # Rewrite all requests for non-exposed files to /web/app.php.
  #
  location / {
    index app.php index.html;
    try_files $uri $uri/ /app.php/$uri?$args;
  }

  #
  # Create separate location for Contao backend to increase POST request size
  # there.
  #
  # NOTE! This location is circumventing regular request "rewriting" using
  #       try_files and thus needs to patch SCRIPT_FILENAME and SCRIPT_NAME
  #       of fastcgi_params to mock the regular behaviour of PHP processing.
  #
  location ~ ^/contao(/|$) {
    include fastcgi_params;

    fastcgi_pass unix:/run/php/php7.1-fpm.sock;
    fastcgi_index app.php;

    fastcgi_param PHP_ADMIN_VALUE "open_basedir=/var/www/www.foo.com/:/tmp/";

    # mock information on script to be processed in PHP actually
    fastcgi_param SCRIPT_FILENAME $document_root/app.php;
    fastcgi_param SCRIPT_NAME /app.php;

    client_max_body_size 20m;
  }

  #
  # Pass all requests for PHP documents to PHP FPM service.
  #
  location ~ \.php(/|$) {
    include fastcgi_params;

    fastcgi_pass unix:/run/php/php7.1-fpm.sock;
    fastcgi_index app.php;

    fastcgi_param PHP_ADMIN_VALUE "open_basedir=/var/www/www.foo.com/:/tmp/";
  }

  #
  # Declare images to be cached for up to 30 days.
  #
  location ~* \.(gif|jpg|png)$ {
    expires 30d;
  }
}