即使客户端断开连接，Node.js服务器也会保留流数据 [英] Node.js server keeps streaming data even after client disconnected

问题描述

我有一个小型Node.js + express服务器，它有一个虚拟下载方法：

I have a small Node.js + express server which has a dummy download method:

app.get("/download",function(req,res) {

    res.set('Content-Type', 'application/octet-stream');
    res.set('Content-Length', 1000000000011);
    res.set('Connection', 'keep-alive');
    res.set('Content-Disposition', 'attachment; filename="file.zip"');

    var interval = setInterval(function(){
        res.write(00000000);
        var dateStr = new Date().toISOString();
        console.log(dateStr + " writing bits...");
    },500);
});

问题是我关闭浏览器后仍然看到节点服务器正在传输数据。
如何检测客户端何时断开连接并停止流式传输？

The problem is that after I close the browser I still see that the node server is transferring data. How can I detect when the client is disconnected and stop the streaming?

我尝试使用：

req.on("close", function() {
    console.log("client closed");
});

req.on('error', function(e) {
  console.log('problem with request: ' + e.message);
});

但没有运气。任何帮助将不胜感激。

But without luck. Any help will be appreciated.

推荐答案

浏览器关闭时不会向服务器发送http请求，我无法在Node.js文档中找不到有关请求对象上的close事件的任何内容。但是，我使用Socket.io设置了类似的东西。此示例每秒向客户端推送一个随机数，并在客户端断开连接后停止推送数据：

The browser won't send an http request to the server when it closes, and I couldn't find anything in the Node.js docs about a close event on the request object. However, I have set something up similar to this using Socket.io. This example pushes a random number to the client every second, and stops pushing data after the client disconnects:

io.on('connection', function(socket) {
  var intervalID = setInterval(function () {
    socket.emit('push', {randomNumber: Math.random()});
  }, 1000);
  socket.on('disconnect', function () {
    clearInterval(intervalID);
  });
}

以下是使用Express设置Socket.io 。

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