When an exception is thrown during processing of a REST API request, the exception is converted to a simplified error message. The full contextual detail of the exception may be useful for troubleshooting. This patchset modifies exception handling routines in the REST API to store the exception in the request, where it may be accessed by a debugger or filter. Change-Id: I6495d3fb72b755b91b77f05de247b2dd03a8fe2c