inconsistent-error-format

Error details returned from REST API as part of http response body have
more than one format.
FORMAT 1:
----------
{
explanation: "The resource could not be found."
code: 404
-error:
{ message: "Table 'resources111' does not exist" traceback: null type: "TableNotExistsException" }
title: "Not Found"
}
In some cases we also get error response in following format
FORMAT 2
----------
{"__type":"com.amazonaws.dynamodb.v20111205#ResourceInUseException","message":"T he resource which you are attempting to change is in use."}
It would be good to have all errors returned in same consistent format.