在NodeJs中上传文件时停止请求 [英] Stop request during file upload in NodeJs

问题描述

我正在写一个图片上传器，我想将图片的大小限制在3mb以下。在服务器端，我可以检查标题中图像的大小，像这样（使用快递）：

  app .post（'/ upload'，function（req，res）{
 if（+ req.headers ['content-length']> 3001000）{//约3mb 
 //做某事停止结果
返回res.send（{'error'：'某种错误'}）; 
} 
 //在这里数据流... 
} 
  

我试图通过（和permations）停止req（

  req.shouldKeepAlive = false; 
 req.client.destroy（）; 
 res.writeHead（200，{'Connection'：'close' }）; 
 res.end（）
  

没有一个真的销毁请求以防止更多的数据上传
req.client.destroy（）似乎冻结下载，但res.send（{错误...不被发送回来。

帮助！

解决方案

抛出一个错误并捕获它。上传，允许您发送回复。

  try {throw new Error（Stopping file upload ...）; } 
 catch（e）{res.end（e.toString（））; } 
  

这有点冒险，但是它可以工作...

I'm write an image uploader, and I want to constrain the size of the image to under 3mb. On the server side, I can check the size of the image in the header, something like this (using express):

app.post('/upload', function(req, res) {
  if (+req.headers['content-length'] > 3001000) { // About 3mb
     // Do something to stop the result
     return res.send({'error': 'some kind of error'});
  }
  // Stream in data here...
}

I tried to stop the req by (and permuations of)

req.shouldKeepAlive = false;
req.client.destroy();
res.writeHead(200, {'Connection': 'close'});
res.end()

None of them really "destroys" the request to prevent more data being uploaded. req.client.destroy() seem to freeze the download, but the res.send({error... is not being sent back.

Help!

解决方案

Throw an error and catch it. It will stop the file upload, allowing you to send a response.

try { throw new Error("Stopping file upload..."); } 
catch (e) { res.end(e.toString()); }

It's a bit hackish, but it works...

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