Python flaskajax返回POST HTTP/1.1“；400上传时出错

大家好，我有一个像这样的上传按钮的简单表单

<form role="form" id="sf" name = "sf" method="post" 
  enctype="multipart/form-data" action="javascript:void();">
<input type="file" id="file" name="file" class="file">
</form>

$('#file').bind('change', function() {
        var form_data = new FormData($('#suject-form')[15]);

        var request = $.ajax({
         url: "/upload",
         type: "POST",
         contentType: "application/json",
         cache: false,
         processData: false,
         async: false,
         data: {
      file: new FormData($('#suject-form')[0]), 
      state: 'testing'
    },  
    dataType: "json",
  })
         .done(function(data){
          console.log(data);

        })
return false;
});

- 当我试图获取文件数据时，它总是给我400错误

-

---

有人知道我做错了什么吗？谢谢

也许您应该看看实际上可能更相关：

JSON.stringify

似乎缺少

data

字段

@app.route('/upload', methods=['POST'])
def upload():

    if request.method == 'POST':
        state= request.form['state']
        files = request.files['file']
        # if I leave out file it returns but fails when leave in files


    return jsonify(result=[state])