#import "CNMSession.h"
#import "CNMRequest.h"
#import "CNMURLSessionDataTask.h"

...

    CNMRequest *request = [[CNMRequest alloc] init];
    request.URL = [NSURL URLWithString:@"http://exampleapi.com/json"];

    CNMURLSessionDataTask *task = [[CNMSession defaultSession] dataTaskFromRequest:request];

    task.onCompletion = ^void(NSData *data, NSURLResponse *response, NSError *error)
    {
        if (!error)
        {
            // Raw data to JSON.
            NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data
                                                                 options: NSJSONReadingMutableContainers
                                                                   error: nil];
        }
        else
        {
            NSLog(@"error %@", error);
        }
    };

    [task resume];