Ahoana ny fomba hamaritana rehefa vita ny NSURLConnection iray

Miezaka mampiasa NSURLRequest sy NSURLConnection aho hahazoana angon-drakitra kely (manodidina ny 50 bytes) avy amin'ny tranonkala API. Azoko antoka fa marina ny kaody etsy ambany, fa ahoana kosa no ahazoako ny angona voaray sy hitako raha alaina daholo izy io?

NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://google.com"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:20.0];
NSURLConnection *con = [[NSURLConnection alloc] initWithRequest:req delegate:self];