Express js：如何使用POST请求下载文件 [英] Express js: How to download a file using POST request

问题描述

当我使用GET，一切都正常。但是，我很难使用POST实现相同的效果。以下是我尝试过的代码：

When I use GET, everything works fine. However, I struggle to use POST to achieve the same effect. Here are the code I have tried:

1。

app.post("/download", function (req, res) {
    res.download("./path");
});

2。

app.post("/download", function (req, res) {
    res.attachment("./path");
    res.send("ok");
});

3。

app.post("/download", function (req, res) {
    res.sendFile("./path");
});

它们都不工作。这样做的正确方法是什么？

None of them work. What is the correct way to do this?

编辑：
我通过HTML表单向 / download 。 ./ path 是一个静态文件。当我在方法1中使用代码时，我可以在开发者工具中看到正确的响应头和响应体。但是浏览器不会提示下载。

I submit a POST request through a HTML form to /download. ./path is a static file. When I use code in method 1, I can see the correct response header and response body in the developer tool. But the browser does not prompt a download.

推荐答案

这可能不是你想要的，但是我一直都是这样麻烦。
这是我最后所做的：

This might not be exactly what you want, but I have been having the same trouble. This is what I did in the end:

• 客户端

• Client

$http.post('/download', /**your data**/ ).
  success(function(data, status, headers, config) {
    $window.open('/download'); //does the download
  }).
  error(function(data, status, headers, config) {
    console.log('ERROR: could not download file');
  });

• em>



// Receive data from the client to write to a file
app.post("/download", function (req, res) {
    // Do whatever with the data
    // Write it to a file etc...
});

// Return the generated file for download
app.get("/download", function (req, res) {
    // Resolve the file path etc... 
    res.download("./path");
});

或者，您刚刚尝试调用 $ window.open（/ download）; 从HTML？这是我的下载没有开始的主要原因。它在XHR中返回，我可以看到数据，但也没有提示下载。

Alternatively, have you just tried calling $window.open(/download); from the HTML? This was the main reason why my download did not start. It returned in the XHR and I could see the data, but also did not prompt a download.

*编辑：
客户端代码不准确，经过一些更多的测试，原来我只需要在客户端执行以下操作：


* The client code was not accurate, after some more testing it turned out that I only needed to do the following on the client:

// NOTE: Ensure that the data to be downloaded has 
// already been packaged/created and is available
$window.open('/download'); //does the download

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