AFNetworking post parameters not encoding

Question

I'm getting an error using AFNetworking 2.0 while using post method in Swift language because the body isn't encoded as it should be, here is my code:

let manager = AFHTTPRequestOperationManager()
manager.securityPolicy.allowInvalidCertificates = true;

let reqSerializer: AFJSONRequestSerializer = AFJSONRequestSerializer()
reqSerializer.setValue("T-Rex", forHTTPHeaderField: "User-Agent")
reqSerializer.setValue("no-cache", forHTTPHeaderField: "Cache-Control")
reqSerializer.setValue("apikey", forHTTPHeaderField: "Authorization")
manager.requestSerializer = reqSerializer

let resSerializer: AFJSONResponseSerializer =  AFJSONResponseSerializer()
resSerializer.acceptableContentTypes = ["text/html", "application/json"]
manager.responseSerializer = resSerializer;
let params: NSDictionary = ["userName" : userName, "passWord" : passWord]

manager.POST(Constants.apiURL.url + "users/login",
    parameters:params,
    success: { (operation: AFHTTPRequestOperation!, responseObject: AnyObject!) in
        NSLog("Success! Response is \(responseObject.description)")
    },
    failure: { (operation: AFHTTPRequestOperation!, error: NSError!) in
        NSLog("Failure! Error is: \(error.localizedDescription)")
})

Debugging the request I get:

POST 'http://api.cc/users/login': {
    Accept = "application/json";
    "Accept-Language" = "pt;q=1, fr;q=0.9, en;q=0.8";
    Authorization = apikey;
    "Cache-Control" = "no-cache";
    "Content-Type" = "application/json";
    "User-Agent" = "T-Rex";
} {"passWord":"123","userName":"123"}

and my server answer:

400 'http://api.cc/users/login' [0.7545 s]: {
    Age = 0;
    Connection = "keep-alive";
    "Content-Length" = 83;
    "Content-Type" = "application/json";
    Date = "Sun, 06 Sep 2015 01:03:00 GMT";
    Server = "nginx/1.8.0";
    Via = "1.1 varnish-v4";
    "X-Varnish" = 950329;
} {"error":true,"message":"Required field(s) userName, passWord is missing or empty"}

I don't know why the username and password is encoded like this:

{"passWord":"123","userName":"123"}

instead of this:

{"passWord:123&userName":123"}

Answer 1

Should AFHTTPRequestSerializer instead of AFJSONRequestSerializer .

Problem solved.