流文件在节点/快递到客户端 [英] Stream files in node/express to client

问题描述

我想将内容流式传输到可能存储在数据库中的客户端，它们将作为文件保存。

显然，res.download会很好地完成这项工作，但是没有一个响应。*函数接受流，只有文件路径。

我看了一下res.download impl，它只是设置Content-Disposition头，然后是sendfile。

所以我可以使用这个帖子作为指导。

但是，似乎我会错过res.send执行的所有包装方面。

目前正在创建临时文件，这样我就可以使用res.download现在。

解决方案

您可以直接流式传输到响应对象（它是一个Stream）。 >

一个基本的文件流看起来像这样。

  function（req， res，next）{
 if（req.url ===somethingorAnother）{
 res.setHeader（content-type，some / type）; 
 fs.createReadStream（./ toSomeFile）。pipe（res）; 
} else {
 next（）; //不是我们的关心，传递给下一个中间件功能
} 
} 
  

这将负责绑定到数据和结束事件。

I want to stream content to clients which is possibly stored in db, which they would save as files.

Obviously res.download would do the job nicely, but none of the response.* functions accept a stream, only file paths.

I had a look at res.download impl and it just sets Content-Disposition header and then a sendfile.

So I could achieve this using this post as a guide. Node.js: pipe stream to response freezes over HTTPS

But it seems I would miss out on all the wrapping aspects that res.send performs.

Am I missing something here or should I just do the pipe and not worry about it - what is best practice here?

Currently creating temp files so I can just use res.download for now.

解决方案

You can stream directly to the response object (it is a Stream).

A basic file stream would look something like this.

function(req, res, next) {
  if(req.url==="somethingorAnother") {
    res.setHeader("content-type", "some/type");
    fs.createReadStream("./toSomeFile").pipe(res);
  } else {
    next(); // not our concern, pass along to next middleware function
  }
}

This will take care of binding to data and end events.

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