# 1.9.24 異步客戶端自動解析域名 [TOC] 在`1.9.24`之前的版本，如果`Client`要通過域名連接服務器，需要手工調用`swoole_async_dns_lookup`函數，否則底層會發生阻塞。在最新的`1.9.24`中底層支持了自動異步解析域名，不再需要顯式調用`swoole_async_dns_lookup`。 ## 有效范圍 * `Swoole\Client` * `Swoole\Http\Client` * `Swoole\Coroutine\Client` * `Swoole\Coroutine\Http\Client` ## 舊版本 ~~~ 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 ~~~ $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"; }); //底層會自動進行異步域名解析 $client->connect('www.baidu.com', 9501); ~~~