The Api compatibillity level is set to .NET Standard 2.0 in the Unity 3d Game engine. To Reproduce Download the Restsharp Version 107.3.0 from Nuget.org Import the dll for .net standard in to your ...

replaces RestSharp package with UnityWebRequests to make it Unity-oriented and compatible with all Unity platforms, specially WebGL. RestSharp does not work in WebGL. Also replaces Task with UniTas ...