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socket 连接不上(前端)问题排查

问题描述

不知什么时候开始,socket.io 一直连接不上,接口未报错,请求也正确返回了,但是就是一直 polling

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XHR?EIO=4&transport=polling&t=Nz64TWU
XHR?EIO=4&transport=polling&t=Nz64Uxr
XHR?EIO=4&transport=polling&t=Nz64WSS
XHR?EIO=4&transport=polling&t=Nz64YD1
XHR?EIO=4&transport=polling&t=Nz64ZbS
XHR?EIO=4&transport=polling&t=Nz64b3e
XHR?EIO=4&transport=polling&t=Nz64cXX
XHR?EIO=4&transport=polling&t=Nz64eCf
XHR?EIO=4&transport=polling&t=Nz64fmH
XHR?EIO=4&transport=polling&t=Nz64hK7
XHR?EIO=4&transport=polling&t=Nz64iml
XHR?EIO=4&transport=polling&t=Nz64kMs
XHR?EIO=4&transport=polling&t=Nz64luP
XHR?EIO=4&transport=polling&t=Nz64nR4
XHR?EIO=4&transport=polling&t=Nz64pAJ
XHR?EIO=4&transport=polling&t=Nz64qyl
XHR?EIO=4&transport=polling&t=Nz64sSR

前端代码是这样写的

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import Echo from "laravel-echo";
import ioClient from "socket.io-client";

window.io = ioClient;
window.Echo = new Echo({
broadcaster: "socket.io",
host: "https://example.com",
});

对应的版本为

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"socket.io-client": "^4.4.0",
"laravel-echo": "^1.11.3",

解决方法

将从 npm 依赖的包,采用远程加载即可

在 html 引用 script 文件

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<script src="https://cdnjs.cloudflare.com/ajax/libs/laravel-echo/1.10.0/echo.iife.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/socket.io-client@2/dist/socket.io.js"></script>

这里我们就直接调用 window 上的对象即可

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window.Echo = new window.Echo({
broadcaster: 'socket.io',
host: import.meta.env.VITE_APP_ECHO_SERVER,
auth: { headers: { Authorization: 'Bearer ' + token } }
});

具体原因不清楚,但是如果通过 import 方式引用 socket.io-client 就一直 polling

但是通过 script 标签引用就没问题(🤔 奇怪了)