upstream backend {
    server app:3000;
}

server {
    listen 80;

    # default docker DNS
    resolver 127.0.0.11 ipv6=off valid=10s;

    # . files
    location ~ /\.(?!well-known) {
        deny all;
    }

    # logging
    access_log /var/log/nginx/access.log;
    error_log  /var/log/nginx/error.log warn;

    # reverse proxy
    location / {
        proxy_pass                         http://backend$request_uri;
        proxy_set_header Host              $host;
        proxy_http_version                 1.1;

        # proxy headers
        proxy_set_header   Host $host;
        proxy_set_header   X-Real-IP $remote_addr;
        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header   X-Forwarded-Host $server_name;

        # proxy timeouts
        proxy_connect_timeout              60s;
        proxy_send_timeout                 60s;
        proxy_read_timeout                 60s;
    }

    # favicon.ico
    location = /favicon.ico {
        log_not_found off;
    }

    # robots.txt
    location = /robots.txt {
        log_not_found off;
    }

    # gzip
    gzip            on;
    gzip_vary       on;
    gzip_proxied    any;
    gzip_comp_level 6;
    gzip_types      text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml image/svg+xml;
}