message: add close test for memleak
diff: @@ -14,6 +14,7 @@ Swoole\Async::dnsLookup("www.htmleaf.com", function ($domainName, $ip) {
  ]);
  $cli->get('/', function ($cli) {
  echo "Length: " . strlen($cli->body) . "\n";
  +$cli->close();
  // echo $cli->body;
  });
  });
  