Node/Express：stream.pipe() 上没有下载

Question

当我通过管道传输响应时，有什么方法可以强制下载吗？如果我查看 Chrome 工具，我会发现响应正常，标题也很好：

HTTP/1.1 200 OK
Server: Cowboy
Connection: keep-alive
X-Powered-By: Express
Content-Type: application/pdf
Date: Mon, 10 Oct 2016 20:22:51 GMT
Transfer-Encoding: chunked
Via: 1.1 vegur
Request Headers
view source

我什至在详细响应中看到了 pdf 文件代码，但没有启动文件下载。也许我错过了什么？

我的路线代码如下所示：

router.post('/reports/create', access.Regular, function (req, res, next) {
    ...

    pdf.create(html).toBuffer(function(err, buffer){
        res.writeHead(200, {
            'Content-Type': 'application/pdf',
            'Content-Disposition': 'attachment; filename=some_file.pdf',
            'Content-Length': buffer.length
        });
        res.end(buffer)
    });
});

Answer 1

您需要添加一个Content-Disposition标头来向浏览器发出信号，表明有附加的内容需要下载。

app.get('/:filename', (req, res) => {
  // Do whatever work to retrieve file and contents      

  // Set Content-Disposition Header on the response
  // filename is the name of the file the browser needs to download when 
  // receiving  the response to this particular request
  res.setHeader('Content-Disposition', `attachment; filename=${req.params.filename}`);

  // stream the fileContent back to the requester
  return res.end(fileContent)
});