I am unable to upload my image to server using multipart data in swift3?

Question

I am unable to upload my image on server. I am using multpart form data.I am selecting Image from ImagePicker controller.Everything is set Imagerpicker delegate each and everything .after uploading image it is not shoeing any error but image is not uploading on server.and also when I select image using imagepicker it shows a error like Creating an image format with an unknown type is an error but my app does not crashes

this is the code that I am using in swift3 for sending image. Here is my Code that I am Using.

viewcontroller.swift //I am not writnig full code but from the following action of button i am calling that function

    button Action{
    // my image
    let image = userImage.image
    let unwrappedImage = image!
    let data = UIImageJPEGRepresentation(unwrappedImage, 1.0)
    let params = ["user_dob":dob, "user_gender":"1", "user_name":   username, "user_status":userstatus] as NSDictionary
    self.UploadRequest(image:data,parameters:params)

    }

my function for uploading image and data

    func UploadRequest(image:NSData,parameters:NSDictionary){
    let url = NSURL(string: "myURL")
    let request = NSMutableURLRequest(url: url! as URL)
    request.httpMethod = "POST"
    let boundary = generateBoundaryString()
    let secretKey = defaults.string(forKey: "secretKey")

    request.setValue(secretKey, forHTTPHeaderField: "auth_key")

request.setValue("multipart/form-data; boundary=\(boundary)",forHTTPHeaderField: "Content-Type")

    let body = NSMutableData()

    body.append("--\(boundary)\r\n".data(using: .utf8)!)

    body.append("Content-Disposition:form-data; name=\"test\"\r\n\r\n".data(using: String.Encoding.utf8)!)

    body.append("hi\r\n".data(using: .utf8)!)

    body.append("--\(boundary)\r\n".data(using: .utf8)!)

    //body.append("Content-Disposition:form-data; name=\"file\"; filename=\"\(fname)\"\r\n".data(using: .utf8)!)

    //body.append("Content-Type: \(mimetype)\r\n\r\n".data(using: .utf8)!)

    body.append(image as Data)

    body.append("\r\n".data(using: String.Encoding.utf8)!)

    for(key,value) in parameters{
    body.append("--\(boundary)\r\n".data(using: .utf8)!)
    body.append("Content-Disposition:form-data;      name=\"file\";filename=\"\(key)\"\r\n\r\n\(value)".data(using: .utf8)!)   
   }
    body.append("--\(boundary)--\r\n".data(using: .utf8)!)



    let session = URLSession.shared

    let task = session.dataTask(with: request as URLRequest) {

        (
        data, response, error) in

        guard let _:NSData = data as NSData?, let _:URLResponse = response  , error == nil else
        {
            print("error")

            return
    }let dataString =NSString(data:data!,encoding:String.Encoding.utf8.rawValue)

        print(dataString)

    }

    task.resume()


}