通过Express发送pdf到js客户端并下载 [英] Send pdf via express to js client and download

问题描述

当我这样请求时，我正尝试使用客户端从快递服务器发送pdf文件:

I am trying to send pdf file from my express server using the client when requested like this:

  res.setHeader('Content-Type', 'application/pdf');
  res.setHeader('Content-Disposition', 'attachment; filename=test.pdf');
  fs.createReadStream('test.pdf').pipe(res);

然后在客户端，我尝试通过将结果字符串转换为url并从那里下载来下载它.

And then on the client side I am trying to download it by taking the resulting string converting it to a url and downloading from there.

var blob = new Blob[pdfString], { type: 'application/pdf' });
var url = window.URL;
var downloadUrl = url.createObjectURL(blob);

但是生成的文件有两个空白页，我相信这可能是因为生成的文件的url太大了吗?如果有人能找出问题出在哪里，或者告诉我一种更好的方法，那真是太棒了.

However the resulting file is two empty pages and I beleive think it might be because the resulting file is url is to large? If anyone could figure out whats wrong here or tell me of a better way to do it that would be awesome.

推荐答案

我能够使用XMlHttpRequest找出答案:

I was able to figure it out using XMlHttpRequest:

   var req = new XMLHttpRequest();
      req.open('GET', path , true);
      req.responseType = "arraybuffer";
      req.onload = (event) => {
        downloadPdf(req.response); //This is where I convert to blob
      }
      req.send();

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