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如何处理 EADDRINUSE 错误

监听时最常见的错误之一是 EADDRINUSE。当另一个服务器已经在请求的 port/path/handle 上监听时，就会发生这种情况。

node:events:489
      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRINUSE: address already in use :::8080
    at Server.setupListenHandle [as _listen2] (node:net:1829:16)
    at listenInCluster (node:net:1877:12)
    at Server.listen (node:net:1965:7)

一种处理方法是捕获错误并在一段时间后重试。

const { createServer } = require("node:http");
const { Server } = require("socket.io");

const httpServer = createServer();
const io = new Server(httpServer);

const PORT = process.env.PORT || 8080;

io.on("connection", (socket) => {
  // ...
});

httpServer.on("error", (e) => {
  if (e.code === "EADDRINUSE") {
    console.error("Address already in use, retrying in a few seconds...");
    setTimeout(() => {
      httpServer.listen(PORT);
    }, 1000);
  }
});

httpServer.listen(PORT);

参考: https://node.org.cn/api/net.html#serverlisten

提示

在测试时，您可能不需要使用特定端口。您可以简单地省略端口，操作系统会自动为您选择一个任意的未使用的端口。

const { createServer } = require("node:http");
const { Server } = require("socket.io");

const httpServer = createServer();
const io = new Server(httpServer);

httpServer.listen(() => {
  const port = httpServer.address().port;
  // ...
});

返回示例列表