从Swift

Question

我已使用此代码连接到服务

let login = ["FCAI":"1"]

let url = NSURL(string: "https//172.13.12.2/Image/serive.svc/GetImage")!

let session = NSURLSession.sharedSession()

let request = NSMutableURLRequest(URL: url)

do {

    let auth = try NSJSONSerialization.dataWithJSONObject(login, options: .PrettyPrinted)


    request.setValue("application/json", forHTTPHeaderField: "Content-Type")


    request.HTTPMethod = "POST"


    request.HTTPBody = auth


    let task = session.dataTaskWithRequest(request, completionHandler: { (data, response, error) -> Void in

        print("Got response \(response) with error \(error)")
        print("Done.")
    })


    task.resume()

} catch {

    print("Error")
}

但响应始终是状态400 错误是：

  

服务器在请求中遇到错误处理。异常消息是＆＃39;反序列化system.string类型的对象时出错。结束元素＆＃39; root＆＃39;来自命名空间＆＃39;。