rate limiting a specific location via nginx

rate_limit_nginx.conf

http {
    limit_req_zone $binary_remote_addr zone=limit_req_zone_1:10m rate=10r/s;

    server {
        listen 80;
        server_name example.com;

        location /index/ {
            limit_req zone=limit_req_zone_1 burst=10;

            auth_basic "Restricted Access";
            auth_basic_user_file /path/to/htpasswd;

            proxy_next_upstream error timeout http_500 http_502 http_503 http_504;
            proxy_connect_timeout 10s;
            proxy_read_timeout 10s;

            proxy_pass http://upstream_server;
        }

        error_page 401 = @error401;
        location @error401 {
            limit_req_status 429;
            limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; // modify 's' with 24h for 24h timeout
            return 429;
        }
    }
}