error handler currently does not return and has never returned
the error back to the client application for any in-flight requests
that might have failed or canceled.
make sure we return errors back to the client for even transient
in-flight request errors.
error handler currently does not return and has never returned the error back to the client application for any in-flight requests that might have failed or canceled.
make sure we return errors back to the client for even transient in-flight request errors.