How to get server error in DataSource.handleError

[markwagoner]

I have a servlet that writes the error message to the response output if an error occurs. If the servlet method is invoked from the client using DataSource.fetchData, how do I get the error message within the DataSource.handleError function? Looking at the docs I would assume it would be in the response.data attribute, but this is undefined.

I am using 7.0RC2