openproject/docs/installation-and-operations/configuration/server/nginx.conf

upstream app {
    server web:8080;
}

server {
        listen 80;
	server_name _;

        location / {
            proxy_pass_header  Server;
            proxy_set_header   Host $http_host;
            proxy_redirect     off;
            proxy_set_header   X-Real-IP $remote_addr;
            proxy_set_header   X-Scheme $scheme;
            proxy_pass         http://app/;
        }
}