Properties
data 
@property (nonatomic, readonly) NSData *data
error 
@property (nonatomic, readonly) QBError *error
headers 
@property (nonatomic, readonly) NSDictionary *headers
requestUrl 
@property (nonatomic, readonly) NSURL *requestUrl
status 
@property (nonatomic, readonly) QBResponseStatusCode status
success 
@property (nonatomic, getter=isSuccess, readonly) BOOL success