In the most recent 110.0.0 release there is no longer a RemoveParameter extension method on the DefaultParameters object. I had a method implemented like so to allow me to add/replace a default header: public void AddDefaultHeader(string name, string value) { _restClient.DefaultParameters.RemoveParameter(name); _restClient.AddDefaultHeader(name, value); } but RemoveParameter() is no longer recognised and causes compilation failure. Is there some other way to remove a default parameter now? - OS: Windows 10 x64 - .NET 6 - Version: 110.0.0