nginx.conf

server {
    listen 80;
    server_name localhost;

    location / {
        root /usr/share/nginx/html;
        try_files $uri $uri/ /index.html;
    }

    location ~ ^/(problems|problem_info|run|test)/$ {
        proxy_pass http://backend:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}