When running in dev mode, error messages would contain an additional "error" property alongside "message". Since this causes confusion, that has been removed and now error messages are the same both modes (using "message").
Fix Proxy by UID Failing for UIDs with a Hyphen
Hyphens are allowed in short IDs but not picked up by the
proxyPathRegexp. This caused the end of the uid to be proxied as part of
the path to the backing datasource which would usually cause a 404.
