javascript Express js：如何使用 POST 请求下载文件
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Express js: How to download a file using POST request
提问by wdetac
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:
当我使用 GET 时，一切正常。但是，我很难使用 POST 来达到相同的效果。这是我尝试过的代码：
1.
1.
app.post("/download", function (req, res) {
res.download("./path");
});
2.
2.
app.post("/download", function (req, res) {
res.attachment("./path");
res.send("ok");
});
3.
3.
app.post("/download", function (req, res) {
res.sendFile("./path");
});
None of them work. What is the correct way to do this?
他们都没有工作。这样做的正确方法是什么？
EDIT:
I submit a POST request through a HTML form to /download. ./pathis 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.
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。但是浏览器不提示下载。
回答by avn
This might not be exactly what you want, but I have been having the same trouble. This is what I did in the end:
这可能不是你想要的，但我也遇到了同样的问题。这就是我最后所做的：
- Client
- 客户
$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');
});
- Server
- 服务器
// 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");
});
Alternatively, have you just tried calling $window.open(/download);from the HTML? This was the main reason why my download did not start. It returned in the XHR and I could see the data, but also did not prompt a download.
或者，您是否尝试过从$window.open(/download);HTML调用？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。
*EDIT:The client code was not accurate, after some more testing it turned out that I only needed to do the following on the client:
*编辑：客户端代码不准确，经过更多测试后发现我只需要在客户端上执行以下操作：
// NOTE: Ensure that the data to be downloaded has
// already been packaged/created and is available
$window.open('/download'); //does the download
