standard response handler in iOS with Objective-C

response handler.m

    [[_session dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
 
        if (!error) {
            NSHTTPURLResponse *httpResp = (NSHTTPURLResponse*) response;
            if (httpResp.statusCode == 200) {
                // 3
                NSString *text = 
                 [[NSString alloc]initWithData:data 
                   encoding:NSUTF8StringEncoding];
                dispatch_async(dispatch_get_main_queue(), ^{
                    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
                    self.textView.text = text;
                });
 
            } else {
                // HANDLE BAD RESPONSE //
            }
        } else {
            // ALWAYS HANDLE ERRORS :-] //
        }
        // 4
    }] resume];