我总是遇到Windows not found错误。如何解决？

Question

运行此代码时，我总是得到请求的URL中不允许使用Method。

@app.route('/datauploads',methods=['POST'])
def datauploads():
    if request.method == 'POST' and 'csv_data' in request.files:
    file = request.files['csv_data']
    filename = file.filename
    return render_template('details.html',filename = filename)