JSON params POST not recognize with AFNetworking - json

Question

[Solved]
I'm trying to edit AFHTTPClient.m to make it work with POST Method in
-(NSMutableURLRequest *)requestWithMethod:(NSString *)method
path:(NSString *)path
parameters:(NSDictionary *)parameters
like this :
if ([method isEqualToString:#"GET"] ||[method isEqualToString:#"POST"] || [method isEqualToString:#"HEAD"] || [method isEqualToString:#"DELETE"])
I have problem with POST method with params userDevice ,I have function subclass from AFHTTPClient like this
EDIT:
I used different method like this but same result
-(void)loginWithEmail:(NSString *)email password:(NSString *)passwords
{
NSString *baseurl = #"http://localhost.com:9000/";
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:baseurl]];
[httpClient registerHTTPOperationClass:[AFJSONRequestOperation class]];
[httpClient setDefaultHeader:#"Accept" value:#"application/json"];
[httpClient setAuthorizationHeaderWithUsername:email password:passwords];
and then this is my params :
NSDictionary *data = [NSDictionary dictionaryWithObjectsAndKeys:
model, #"deviceModel",
systemVersion, #"deviceVersion",
[NSNumber numberWithBool:0], #"productionMode",
appVersion, #"appVersion",
deviceType,#"deviceType", nil];
NSError *error = nil;
NSDictionary* jsonObject = [NSDictionary dictionaryWithObjectsAndKeys:data, #"userDevice", nil];
NSData *jsonLogin =[NSJSONSerialization dataWithJSONObject:jsonObject options:NSJSONWritingPrettyPrinted error:&error];
NSString *jsonLoginString = [[NSString alloc] initWithData:jsonLogin encoding:NSUTF8StringEncoding];
NSLog(#"JSON LOGIN OUTPUT :%#", jsonLoginString);
[httpClient setParameterEncoding:AFJSONParameterEncoding];
I request using this code :
NSMutableURLRequest *request = [httpClient requestWithMethod:#"POST"
path:#"/ios/login"
parameters:[NSDictionary dictionaryWithObjectsAndKeys:jsonLoginString,#"userDevice", nil]
];
AFJSONRequestOperation *operation = nil;
operation = [AFJSONRequestOperation
JSONRequestOperationWithRequest:request
success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
NSLog(#"Response : %#", request);
NSLog(#"JSON: %#",JSON);
}
failure:^(NSURLRequest *request , NSHTTPURLResponse *response, NSError *error , id JSON ){
NSLog(#"error: %#", error);
}];
[operation start];
this is the example json that I wanted :
"userDevice" : {
"appVersion" : "1.0",
"deviceModel" : "iPhone Simulator",
"productionMode" : false,
"deviceType" : "iPhone Simulator",
"deviceVersion" : "6.1"
}
am I missing something?