swoole客户端无法连接怎么办

server.php：
<?php
//创建Server对象，监听 10.211.55.15:9501端口
$serv = new swoole_server("10.211.55.15", 9501); // 10.211.55.15 是我们Swoole服务器地址
//监听数据接收事件
$serv->on(&#39;receive&#39;, function ($serv, $fd, $from_id, $data) {
    echo $data; //打印 接收到的数据
    $serv->send($fd, "I am swoole"); //发送字符串给客户端
    $serv->close($fd); // 注意：官方并不建议在这里关闭掉
});
//启动服务器
$serv->start();

php server.php

GET /favicon.ico HTTP/1.1
Host: 10.211.55.15:9501
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:57.0) Gecko/20100101 Firefox/57.0
Accept: */*
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: keep-alive

$serv->close($fd); // 注意：官方并不建议在这里关闭掉

yum install telnet -y

telnet 10.211.55.15 9501
#连接后，敲击键盘`ctrl+]`键，就可以发送消息了，
#比如我们输入
hello
#会紧接着一行显示
I am swoole

$socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP);
socket_connect($socket,"10.211.55.15", 9501);
socket_write($socket,"hello swoole");
// 读
$out = socket_read($socket,1024);
echo $out;
socket_close($socket);

<?php
$client = new swoole_client(SWOOLE_SOCK_TCP);
if (!$client->connect("10.211.55.15", 9501, -1))
{
    exit("connect failed. Error: {$client->errCode}\n");
}
$client->send("hello world\n");
echo $client->recv(); //打印 接收到的数据
$client->close();