使用multer上传文件时重置Node.js连接 [英] Node.js connection reset on file upload with multer
问题描述
我有一个节点/快速应用程序，可以通过multer处理文件上传.在我的本地计算机上一切正常，但是在服务器上，如果上载的文件超过几个Mb，浏览器将因连接重置"错误而停止.
I have a node/express app that handles file uploads with multer. Everything works well on my local machine, but on the server, if the uploaded file exceeds a couple of Mbs, the browser stops with a "connection reset" error.
这是上传脚本的一个简单测试版本:
Here is a simple test version of the upload script:
var express = require('express');
var multer = require('multer');
// Create server
var app = express();
// Start server
function startServer() {
var port = 8888;
server = app.listen(port, function () {
console.log('Node version:' + process.versions.node);
console.log('Express server listening on port %d in %s mode', port, app.settings.env);
});
}
var upload = multer({dest: './tmp/'});
var app = express()
app.post('/', upload.single('data'), function (req, res, next) {
console.log(req.file);
});
startServer();
这是测试上传的html页面:
And here's the html page to test the upload:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>Test Upload</title>
<meta name="description" content="">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<p>Hello world! This is a test upload.</p>
<form method="post" action="http://192.168.1.234:8888" enctype="multipart/form-data">
<label>file</label><br>
<input type="file" name="data"><br>
<input type="submit" name="submit" value="Upload">
</form>
</body>
</html>
我在两台不同的服务器(VPS和裸机)上进行了测试，结果在两台服务器上都出现了相同的错误.上传开始，我可以在 ./tmp 目录中看到该文件的块，但是它永远不会完成，也不会在节点或系统日志中引发任何错误.
I tested on two different servers – a VPS and a bare-metal box – I ended up with the same error on both servers. The upload starts and I can see a chunck of the file in my ./tmp directory, but it never finishes and doesn't throw any error, neither in node nor in the syslog.
推荐答案
@NadavL是正确的，尽管事实上我没有前端服务器，但节点本身正在超时.
@NadavL was right, despite the fact that I had no front server, node was timing out itself.
它是用文档编写的，默认情况下，节点中没有超时.Express可能会覆盖该问题，但我找不到此事的任何信息.
It's written in the docs that there's no timeout in node by default. Express might override that but I couldn't find any information on the matter.
要全局定义特定的超时，您可以通过在服务器连接时更改套接字超时来继续
To define a specific timeout globally, you can proceed by changing the socket timeout when the server connects
[…]
// Start server
function startServer() {
var port = 8888;
server = app.listen(port, function () {
console.log('Node version:' + process.versions.node);
console.log('Express server listening on port %d in %s mode', port, app.settings.env);
});
server.on('connection', function(socket) {
// 10 minutes timeout
socket.setTimeout(10 * 60 * 1000);
});
}
但是，随着超时时间的延长，您的服务器可能会受到 HTTP慢速攻击，您可能希望仅针对特定路由更改默认超时，在我的情况下，仅针对上载路由.在这种情况下，您要做的就是更改路由处理程序中的超时，如下所示:
But as a high timeout rises your server's exposure to Slow HTTP Attacks, you might want to change the default timeout just for a specific route – in my case, just for the upload route. In this particular case, all you have to do is change the timeout in your route's handler like so:
app.post('/myroute', function (req, res) {
// 10 minutes timeout just for POST to myroute
req.socket.setTimeout(10 * 60 * 1000);
upload.single('data');
console.log(req.file);
});
还有一个专用的中间件来处理超时，它被称为 connect-time ，并且可以使用它也可以为不同的路由配置特定的超时(请参见这样的帖子).
There's also a dedicated middleware to handle timeouts, it's called connect-timeout and it can be used to configure specific timeouts for different routes too (see this post on SO).
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