无法让浏览器从快递发起下载 [英] Cannot get browser to initiate download from express

问题描述

继续这个问题，我无法让浏览器从快递发起下载。后端代码：

Following on from this question, I cannot get the browser to initiate a download from express. Backend code:

app.get('/download', (req, res) => {
  res.download('./textfile.txt', (err) => {
    if (err) {
      console.log('error: ' + err);
    }   else {
      console.log('success');
    }
  });
})

我已经从.gpx文件更改为文本文件，以确保它与此无关，我尝试使用如下所示的标题，但无济于事：

I have changed from a .gpx file to text file to ensure its nothing to do with that, and I have tried playing with the headers as below, to no avail:

res.header('Content-Type', 'text/plain')
res.header('Content-Security-Policy', 'upgrade-insecure-requests');

在前端我试过：

window.location.href = 'localhost:3000/download';

和：

const filePath = 'localhost:3000/download';
const link = document.createElement('a');
link.href = filePath;
link.download = filePath.substr(filePath.lastIndexOf('/') + 1);
link.click();

和：

const newWindow = window.open('localhost:3000/download', 'download');

并通过GET请求导航到后端网址（根据我原来的问题回复），但没有他们在浏览器中启动下载。

and navigating to the backend url via GET request (per response to my original question), but none of them initiate the download in the browser.

我认为这是一个前端问题，因为当我在控制台中双击下载时，它会打开。前端获取数据，但浏览器（chrome）没有下载它。我也试过Firefox，结果相同。

I think it is a front-end problem, as when I double-click on the download in the console, it opens. The front end is getting the data, but the browser (chrome) is not downloading it. I also tried Firefox, same result.

有很多类似的问题，但没有一个能解决我的问题。

There are many queries similar to this, but none have solved the issue for me.

推荐答案

您的代码中的问题是您没有将正确的URL传递给 window.open 。您需要包含 http：//

The issue in your code is that you are not passing the correct url to window.open. You need to include http://

window.open('http://localhost:3000/download');

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