I didn't get response with Basic Auth URL using AFNetworking

I used postman and give me that code and i try.

NSDictionary *headers = @{ @"authorization": @"Basic dXNlcl90c19hcGk6cW****************",
                               @"cache-control": @"no-cache",
                               @"postman-token": @"48ca81bb-eea4-7196-*******************" };

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.techshort.in/ts_api/category_list.php"]
                                                           cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                       timeoutInterval:10.0];
    [request setHTTPMethod:@"GET"];
    [request setAllHTTPHeaderFields:headers];

    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
                                                completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                                                    if (error) {
                                                        NSLog(@"%@", error);
                                                    } else {
                                                        NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
                                                        NSLog(@"%@", httpResponse);
                                                    }
                                                }];
    [dataTask resume];

But it doesn't work for me. So how i can use in AFNetworking.