NSURLConnection成功,没有HTTP响应

给我猜个谜: NSURL连接 对象发出多个连续(非并发)https请求。在95%的时间里一切都很好,但是每隔一段时间(大约50-100个请求)我就会遇到委托方法

- (void)connectionDidFinishLoading:(NSURLConnection *)connection;

对委托方法的任何调用

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response

我把问题归结到下面的源头。据我所知,这打破了NSURLConnection的既定行为契约。有没有其他人有这个问题,它是一个已知的错误或我使用NSURLConnection错误?

static BOOL hasSeenResponse = NO;

    //Create a NSURLConnection and start it
-(void) begin {
    NSURL* url = [NSURL URLWithString@"https://some.domain.com/some/path/?some=query"];
    [[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookieAcceptPolicy:NSHTTPCookieAcceptPolicyNever];
    NSURLRequest* request = [NSURLRequest requestWithURL:url];
    if ([NSURLConnection canHandleRequest:request]) {
        NSURLConnection* connection = [[NSURLConnection connectionWithRequest:request delegate:self] retain];
        hasSeenResponse = NO;
        [connection start];
    }
}     

#pragma mark NSURLConnection Delegate Methods
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    if (!hasSeenResponse) {
        NSLog(@"\n\nNo Response Recieved\n");
    }
    [connection release];
    [self begin];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    [connection release];
    [self begin];
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
    hasSeenResponse = YES;
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
}