RestSharp is a lightweight HTTP API client library. It's a wrapper around HttpClient, not a full-fledged client on its own. What RestSharp adds to HttpClient: Default parameters of any kind, not just ...
I would hope to get a meaningful exception. System.ArgumentNullException at System.ThrowHelper.IfNullAndNullsAreIllegalThenThrow[T](Object value, ExceptionArgument ...