SAPUI5 Webservices

Hello

I am calling web services to get data from server.

When I am using those web services with error data in Firefox REST Client i am getting error handled message on server side with status code 400 as Bad Request.

But when same web service I am using from SAPUI5 application,I am getting in to error function but with status code as 500 as HTTP Request fail.

I want show error message which is handled on server side.

Thanks and Regards.