AFNetworking POST Error 3840 [duplicate] - ios

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Cocoa Error 3840 when POST Request with AFNetworking 2
(4 answers)
Closed 7 years ago.
I'm running into a service error as I try to POST some data to a server. I'm confident the error has something to do with my request structure. I'm using AFNetworking and my request looks as follows:
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)
})
}
I've tried variations on the parameters option and I still run into the same problem.
Now here is the method I have written by hand that works just fine and sends data to the server as expected:
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()
}
The above request works just fine and the server can process the incoming JSON and save it in the database successfully.
My server is a WCF service. The interface for the method I'm calling looks like this:
[OperationContract]
[WebInvoke(Method = "POST", RequestFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.WrappedRequest, ResponseFormat = WebMessageFormat.Json, UriTemplate = "/NewUserSignup")]
Response AddNewUser(User newUser);
The actual NSError is:
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)"}
I assume the server is fine and it just has to do with configuring the request properly with AFNetworking. Any help configuring the request properly would be appreciated.

Answer 1

Solution in my case was simple and had to do with the configuration of the NetworkManager.
This worked for me as the NetWorkManager will be receiving JSON from the server:
lazy var networkManager: AFHTTPRequestOperationManager = {
var networkManager : AFHTTPRequestOperationManager = AFHTTPRequestOperationManager()
var jsonRequestSerializer = AFJSONRequestSerializer()
networkManager.requestSerializer = jsonRequestSerializer
return networkManager
}()