What should I do if the swoole client cannot connect?

swooleWhat should I do if the client cannot connect?

Introduction to the 4 ways of client connection to the server

Four ways of client connection: Browser connection

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();

Look at the above carefully Code, after creating the service, we listened to the data reception event, printed the received data, and then output an I am swoole string.

Similarly execute server.php, the terminal command line will be in "waiting state":

php server.php

Then we use Firefox as the client and request the Swoole server: http://10.211.55.15 :9501/

At this time, the (server) terminal will output something similar to the following:

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

This is exactly the content of the HTTP protocol.

Why can it be accessed through a browser?

The browser can be understood as a socket client, completing the transmission process through interaction with the HTTP protocol.

HTTP protocol (application layer) is based on TCP protocol (transport layer). When the browser sends a request, it will send a "string" according to the provisions of the HTTP protocol. After the request is completed, the port will be connected.

Above we accessed the Swoole server through a browser. Some browsers may not work because we simply output a string and did not follow the HTTP protocol.

Four client connection methods: telnet

First of all, we need to slightly modify our server code (server.php) and comment out the following line:

$serv->close($fd); // 注意：官方并不建议在这里关闭掉

If not To install telnet, use the following command to install:

yum install telnet -y

Operation method:

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

Four client connection methods: Write your own socket

First, make sure whether the socket extension is installed.

Use native php code to write a client client.php:

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

Four client connection methods: The client officially provided by Swoole

https://wiki .swoole.com/wiki/page/p-client.html

<?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();

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