Swift：多部分formdata与图像有问题

Question

let manager = AFHTTPRequestOperationManager(baseURL: NSURL(string: strURL))
    print("pram is  \(manager)")

    manager.requestSerializer = AFJSONRequestSerializer()
    manager.responseSerializer = AFJSONResponseSerializer()

    //   let jsonData = try! NSJSONSerialization.dataWithJSONObject(param!, options: .PrettyPrinted)
    let imageData = UIImageJPEGRepresentation(UIImage(named: "placeholder.png")!, 0.5)

    let op : AFHTTPRequestOperation = manager.POST("data", parameters: param, constructingBodyWithBlock: { (formData: AFMultipartFormData!) -> Void in
        formData.appendPartWithFileData(imageData!, name: "photo", fileName: "photo.png", mimeType: "image/jpeg")

        //  print(op)
        },
        success:
        {
            (operation: AFHTTPRequestOperation!, responseObject: AnyObject!) in
            print(responseObject)
        },
        failure: { (operation, error) in
         print("Error: " + error.localizedDescription)
    })!

    op.start()
}

我尝试使用此代码进行多种形式但返回400

我想像

一样发送

{"first_name":"John","last_name":"Doe","dob":"1990-01-02","gender":"M","ph

one_no":"9988475","email":"j.d@gmail.com","password":"john.doe","user_type":"U","facebook_id":""}
----WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="photo"; filename=""
Content-Type: 


----WebKitFormBoundary7MA4YWxkTrZu0gW

我想将我的数据发送到服务器上，就像我发布的内容一样。我试过这个代码来实现，但我不能。请帮助我解决这个问题