message.signal

• 类型：<AbortSignal>

当底层套接字关闭或请求被销毁时会中止的 <AbortSignal>。该信号在首次访问时才会懒惰创建——对于从未使用此属性的请求，不会分配任何 <AbortController>。

🌐 An <AbortSignal> that is aborted when the underlying socket closes or the request is destroyed. The signal is created lazily on first access — no <AbortController> is allocated for requests that never use this property.

当客户端在请求中途断开连接时，这对于取消下游异步工作（例如数据库查询或 fetch 调用）非常有用。

🌐 This is useful for cancelling downstream asynchronous work such as database queries or fetch calls when a client disconnects mid-request.

import http from 'node:http';

http.createServer(async (req, res) => {
  try {
    const data = await fetch('https://example.com/api', { signal: req.signal });
    res.end(JSON.stringify(await data.json()));
  } catch (err) {
    if (err.name === 'AbortError') return;
    res.statusCode = 500;
    res.end('Internal Server Error');
  }
}).listen(3000);const http = require('node:http');

http.createServer(async (req, res) => {
  try {
    const data = await fetch('https://example.com/api', { signal: req.signal });
    res.end(JSON.stringify(await data.json()));
  } catch (err) {
    if (err.name === 'AbortError') return;
    res.statusCode = 500;
    res.end('Internal Server Error');
  }
}).listen(3000);拷贝