ios - AFNetworking POST 错误 3840

Question

这个问题已经有答案了:

Cocoa Error 3840 when POST Request with AFNetworking 2 (4 个回答)

已关闭 8 年前。

当我尝试将一些数据发布到服务器时遇到服务错误。我确信该错误与我的请求结构有关。我正在使用 AFNetworking，我的请求如下所示:

      lazy var networkManager: AFHTTPRequestOperationManager = {

            var networkManager : AFHTTPRequestOperationManager = AFHTTPRequestOperationManager()
            networkManager.requestSerializer.setValue("application/json",
                forHTTPHeaderField: "Content-Type")


            networkManager.responseSerializer.acceptableContentTypes =
                NSSet(array: ["text/plain", "text/html", "application/json"]) as Set<NSObject>



            return networkManager
            }()

func createNewAccount(username:String, password:String, onCompletion:Closures.ServiceResponse) -> Void{

        let parameters: [String: AnyObject] = [
            "newUser": [
                "name": username,
                "password": password
            ]
        ]



        var err : NSError?
        var jsonData = NSJSONSerialization.dataWithJSONObject(parameters, options: nil, error: &err)
        var jsonString = NSString(data: jsonData!, encoding: NSUTF8StringEncoding)


        networkManager.POST(Constants.STAGING_URL + "/Services/UserService/UserService.svc/NewUserSignup",
        parameters: jsonString,
        success: { (operation: AFHTTPRequestOperation!,responseObject: AnyObject!) in
            println(responseObject)
        },
        failure: { (operation: AFHTTPRequestOperation!,error: NSError!) in
            println(error.localizedDescription)
            println(operation.responseString)
        })
    }

我尝试了参数选项的变体，但仍然遇到同样的问题。

现在这是我手工编写的方法，它工作得很好，并按预期将数据发送到服务器:

 func signupNewUser(userName : String, password : String){

        let jsonObject: [String: AnyObject] = [
            "newUser": [
                "name": userName,
                "password": password
            ]
        ]

        var urlString = Constants.STAGING_URL + "/Services/UserService/UserService.svc/NewUserSignup"

        var request = NSMutableURLRequest(URL: NSURL(string: urlString)!)
        var session = NSURLSession.sharedSession()
        request.HTTPMethod = "POST"

        var err: NSError?
        request.HTTPBody = NSJSONSerialization.dataWithJSONObject(jsonObject, options: nil, error: &err)
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
        request.addValue("application/json", forHTTPHeaderField: "Accept")

        var jsonData = NSJSONSerialization.dataWithJSONObject(jsonObject, options: nil, error: &err)

        var jsonString = NSString(data: jsonData!, encoding: NSUTF8StringEncoding)

        request.setValue(jsonString! as String, forHTTPHeaderField: "json")

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

        task.resume()

    }

上面的请求工作正常，服务器可以处理传入的 JSON 并将其成功保存到数据库中。

我的服务器是 WCF 服务。我调用的方法的接口(interface)如下所示:

  [OperationContract]
        [WebInvoke(Method = "POST", RequestFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.WrappedRequest, ResponseFormat = WebMessageFormat.Json, UriTemplate = "/NewUserSignup")]
        Response  AddNewUser(User newUser);

实际的 NSError 是:

Printing description of error:
Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (JSON text did not start with array or object and option to allow fragments not set.) UserInfo=0x7f98a0c58910 {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set., NSUnderlyingError=0x7f98a0c582f0 "Request failed: bad request (400)"}

我认为服务器很好，它只与使用 AFNetworking 正确配置请求有关。任何帮助正确配置请求的帮助将不胜感激。

Answer 1

我的案例的解决方案很简单，与 NetworkManager 的配置有关。

这对我有用，因为 NetWorkManager 将从服务器接收 JSON:

 lazy var networkManager: AFHTTPRequestOperationManager = {

        var networkManager : AFHTTPRequestOperationManager = AFHTTPRequestOperationManager()

        var jsonRequestSerializer = AFJSONRequestSerializer()

        networkManager.requestSerializer = jsonRequestSerializer

        return networkManager
        }()