Success/Error messages in OData Service from ECC

Hi Team,

     I want to return messages which are coming from ECC to Front end with error type and description.

          1.I'm using class - /iwbep/if_message_container to return message, even then it is not showing any response to front end for type 'S' Success message.

          2. For Query operation (GetEntitySet method) - Return messages are not showing any response in Rest Client for return type 'E' , but return messages are coming from ECC.

Please suggest any better way to send response to front end.

Regards,

Sathish.