server {

  listen 80;
  listen [::]:80;

  server_name backend.${DOMAIN_NAME};

  location / {
    proxy_pass http://unix:/var/run/taler/merchant-httpd/merchant-http.sock;
    proxy_set_header X-Forwarded-Proto "${PROTO}";
    proxy_set_header X-Forwarded-Host "backend.${DOMAIN_NAME}";
    proxy_set_header X-Forwarded-Prefix /;
  }
}