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com.baidubce 
       ├── auth                                        //BCE's signature related class 
       ├── http                                        //BCE's Http communication related class 
       ├── internal                                    //SDK's internal class 
       ├── model                                       //BCE's public model class 
       ├── services 
       │       └── media                               //Media service-related class 
       │           ├── model                           //Media's internal model such as Request and Response 
       │           └── MediaClient.class               //Media client entrance class 
       ├── util                                        //BCE's utility tool class 
       ├── BceClientConfiguration.class                //Configuration of BCE's HttpClient 
       ├── BceClientException.class                    //Exception class of BCE's client 
       ├── BceServiceException.class                   //The exception class after interacting with the BCE's server 
       ├── ErrorCode.class                             //BCE's general error code 
       └── Region.class                                //BCE's service region