使用 http 将文件上传到运行 python flask 的服务器时，文件名中的特殊字符丢失

Question

example file name: 2^8.txt
my request:

var fileSelect = document.getElementById('myfile');
var files = fileSelect.files;
var formData = new FormData();
var file = files[0]; 
formData.append('file', file, file.name);

How i printed the file name using python flask:

if request.method == 'POST':
        if 'file' not in request.files:
            flash('No file part')
            return jsonify(status="fail")
        file = request.files['file']
        filename = secure_filename(file.filename)
        print(filename)

I got 28.txt instead of 2^8.txt
I have tried using encodeURI(), but it didn't work.

Answer 1

The "^" character is being removed by the secure_filename(file.filename) function call, because werkzeug deems it unsafe (I'm not sure why but there will be a reason.).