events {
    worker_connections 1024;
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;
    sendfile      on;
    keepalive_timeout 65;
    client_max_body_size 200m;

    upstream backend {
        server ${BACKEND_HOST};
    }

    server {
        listen 80;
        root /usr/share/nginx/html;

        location / {
            try_files $uri $uri/ /index.html;
        }

        location /api/ {
            proxy_pass http://backend;
            proxy_set_header Host $host:$server_port;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
            proxy_set_header X-Forwarded-Port $server_port;
            proxy_http_version 1.1;
            proxy_set_header Connection "";
            proxy_read_timeout 1200s;
            proxy_buffering off;
        }

        location /health {
            return 200 'ok';
            add_header Content-Type text/plain;
        }

        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
            root /usr/share/nginx/html;
        }
    }
}