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我在使用 AFNetworking 时遇到问题。我的网络服务期望 NSString 类型的两个参数返回 YES 或 NO。我的代码是这个

AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:@" http://webservice.com "]];

NSMutableURLRequest *request = [httpClient requestWithMethod:@"GET"
                                                        path:path
                                                  parameters:@{
                                @"password":@"password",
                                @"username":@"username"}


                                ];

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]initWithRequest:request];

operation.outputStream = [NSOutputStream outputStreamToFileAtPath:path append:NO];

[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject)  {

    NSLog(@"success: %@", operation.responseString);


}
                                  failure:^(AFHTTPRequestOperation *operation, NSError *error) {
                                      NSLog(@"error: %@",  operation.responseString);

                                  }
 ];

NSLog(@"%@", operation.request);

[operation start];

它没有写：

NSLog(@"success: %@", operation.responseString); 瓯

NSLog(@"错误：%@", operation.responseString);

也就是说，不会进入 blcok。

有什么建议吗？

问候

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