如何关闭节点中的无界和管道流请求? [英] How to close an unbounded and piped stream request in node?

问题描述

我的 node/express 应用程序有一个端点，它代理来自内部服务的数据流，该服务使用服务器发送的事件.这意味着内部服务将永远继续流式传输数据，直到连接关闭.

My node/express application has an endpoint that's proxying a stream of data from an internal service, which is using server-sent events. This means the internal service will continue to stream data in eternity until the connection closes.

效果很好，但是当浏览器关闭与我的节点应用程序的连接时，与内部服务的管道连接保持打开状态，导致内部服务有大量打开/未使用的连接.

It works well, but when the browser closes the connection to my node app, the piped connection to the internal service stays open, causing the internal service to have a lot of open/unused connections.

所以我试图在节点连接关闭时强制关闭管道连接，但似乎不知道该怎么做.

So I'm trying to force close the piped connection when the node connection closes, but can't seem to figure out how to do it.

代码看起来像这样.使用 request/request 库进行管道传输.

Code looks something like this. Piping using the request/request library.

import request from 'request';

app.get('/stream', (req, res) => {
  const stream = request.get({
    url: 'https://internalservice.acme.com/stream'
  })
  stream.on('error', console.log);
  stream.pipe(res);
  // When browser closes...
  req.on('close', () => {
      // ...close connection to internal service
      stream.destroy() // <-- doesn't work
  });
});

推荐答案

当你在 Node 中发出请求时，有 abort() 方法.它将关闭您的请求流.

When you're making a request in Node, there is the abort() method. It will close your request stream.

req.on('close', () => {
  // ...close connection to internal service
  stream.abort()
});

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