# 1.9.24 异步客户端自动解析域名 在`1.9.24`之前的版本，如果`Client`要通过域名连接服务器，需要手工调用`swoole_async_dns_lookup`函数，否则底层会发生阻塞。在最新的`1.9.24`中底层支持了自动异步解析域名，不再需要显式调用`swoole_async_dns_lookup`。 有效范围 ----- * `Swoole\Client` * `Swoole\Http\Client` * `Swoole\Coroutine\Client` * `Swoole\Coroutine\Http\Client` 旧版本 ---- ```php swoole_async_dns_lookup("www.baidu.com", function ($domain, $ip) { $client = new swoole_client(SWOOLE_SOCK_TCP, SWOOLE_SOCK_ASYNC); $client->on("connect", function(swoole_client $cli) { $cli->send("GET / HTTP/1.1\r\n\r\n"); }); $client->on("receive", function(swoole_client $cli, $data){ echo "Receive: $data"; $cli->send(str_repeat('A', 100)."\n"); sleep(1); }); $client->on("error", function(swoole_client $cli){ echo "error\n"; }); $client->on("close", function(swoole_client $cli){ echo "Connection close\n"; }); $client->connect( $ip, 9501); }); ``` 新版本 --- ```php $client = new swoole_client(SWOOLE_SOCK_TCP, SWOOLE_SOCK_ASYNC); $client->on("connect", function(swoole_client $cli) { $cli->send("GET / HTTP/1.1\r\n\r\n"); }); $client->on("receive", function(swoole_client $cli, $data){ echo "Receive: $data"; $cli->send(str_repeat('A', 100)."\n"); sleep(1); }); $client->on("error", function(swoole_client $cli){ echo "error\n"; }); $client->on("close", function(swoole_client $cli){ echo "Connection close\n"; }); //底层会自动进行异步域名解析 $client->connect('www.baidu.com', 9501); ```