gistfile1.txt

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:@"http://someurl/blah];

AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id resultJSON) {
        [self processResult:resultJSON];
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        [self processFailuer:error];
    }];

[operation start];