通过失败block内的参数error取得，代码如下：
NSData *data = (NSData *)error.userInfo[AFNetworkingOperationFailingURLResponseDataErrorKey] ;
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
通过失败block内的参数error取得，代码如下：
NSData *data = (NSData *)error.userInfo[AFNetworkingOperationFailingURLResponseDataErrorKey] ;
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
本文标题：AFNetworking3.x获得failure时候的respo
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