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@interface RequestOperation : NSOperation {
  NSURLRequest*  _request;
  NSMutableData* _data;
}

- (id)initWithRequest:(NSURLRequest *)request;

@end

@implementation RequestOperation

- (id)initWithRequest:(NSURLRequest *)request {
  if (self = [self init]) {
    _request = [request retain];
    _data = [[NSMutableData data] retain];
  }
  return self;
}

- (void)dealloc {
  [_request release];
  [_data release];
  [super dealloc];
}

// 如果不载下面的函数，会出错
- (BOOL)isConcurrent {
  return YES;
}

// 开始处理
- (void)start {
  if (![self isCancelled]) {
    // 以异步方式处理事件
    [NSURLConnection connectionWithRequest:_request delegate:self];
  }
}

// 取得数据
- (void)connection:(NSURLConnection*)connection
    didReceiveData:(NSData*)data {
  // 添加数据
  [_data appendData:data];
}

// HTTP请求结束
- (void)connectionDidFinishLoading:(NSURLConnection*)connection {
}

@end

_NSAutoreleaseNoPool(): Object 0x18a140 of class NSURLConnection autoreleased with no pool in place - just leaking

@interface xxViewController : UIViewController {
  NSOperationQueue* _queue;
}

@end

@implementation xxViewController

- (IBAction)buttonClicked:(id) sender {
  _queue = [[NSOperationQueue alloc] init];
  // 第一个请求
  NSURLRequest* request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.google.com"]];
  RequestOperation* operation = [[RequestOperation alloc] initWithRequest:request];
  [operation autorelease];
  // 第二个请求
  NSURLRequest* request2 = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.yahoo.co.jp"]];
  RequestOperation* operation2 = [[RequestOperation alloc] initWithRequest:request2];
  [operation2 autorelease];
  // 开始处理
  [_queue addOperation:operation];
}

@end