Linux 命令行测试WebSocket

2019-10-29 必备技能阅读量

Linux环境下，分别使用curl和wscat命令测试websocket连接。

websocket

这里用swoole搭建一个websocket server

<?php

// 创建WebSocket服务器对象, 监听0.0.0.0:9502
$web_socket = new swoole_websocket_server('0.0.0.0', 9502);

$web_socket->on('start', function ($web_socket) {
    echo "WebSocket server is started at http://127.0.0.1:9502\n";
});

// 监听WebSocket连接打开事件
$web_socket->on('open', function ($web_socket, $request) {
    var_dump($request->fd, "Hello, Welcome client-{$fd}\n");
});

// 监听WebSocket消息事件
$web_socket->on('message', function ($web_socket, $frame) {
    echo "received message: {$frame->data}\n";
    $web_socket->push($frame->fd, "server: {$frame->data}");
});

// 监听WebSocket连接关闭事件
$web_socket->on('close', function ($web_socket, $fd) {
    echo "client-{$fd} is closed\n";
});

// 开启服务
$web_socket->start();

开启websocket server

1 2	[root@caoxl Start]# php websocket_server.php WebSocket server is started at http://127.0.0.1:950

wscat

wscat是一个用来连接websocket的命令行工具，nodejs开发的。

[root@caoxl Start]# npm install -g wscat
/root/.nvm/versions/node/v11.1.0/bin/wscat -> /root/.nvm/versions/node/v11.1.0/lib/node_modules/wscat/bin/wscat
+ wscat@3.0.0
added 12 packages from 9 contributors in 8.03s

// 测试一下
[root@caoxl Start]# wscat -V
3.0.0

使用wscat测试WebSocket

1
2
3

> [root@caoxl Start]# wscat -c ws://127.0.0.1:9502
Connected (press CTRL+C to quit)
>

curl

curl --include \
     --no-buffer \
     --header "Connection: Upgrade" \
     --header "Upgrade: websocket" \
     --header "Host: http://127.0.0.1:9502" \
     --header "Origin: http://www.caoxl.com" \
     --header "Sec-WebSocket-Key: NVwjmQUcWCenfWu98asDmg==" \
     --header "Sec-WebSocket-Version: 13" \
     http://127.0.0.1:9502

注意这里不需要特定的密钥（Sec-WebSocket-Key），所以随便取一个都可以。该头文件的作用是防止缓存websocket请求。

正常情况下输出如下：

HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: oPhRcOTYgRvrC0D+cTPcN3XYC1k=
Sec-WebSocket-Version: 13
Server: swoole-http-server