I need to get the client's IP address in .net standard 2.1 class library application.

I am using the code below, It works as expected in the .net framework, but its giving compilation error in .net standard.

```
private string IPAddress { get { return HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; } }

```

> 
> Error CS1061 'HttpRequest' does not contain a definition for
> 'ServerVariables' and no accessible extension method 'ServerVariables'
> accepting a first argument of type 'HttpRequest' could be found (are
> you missing a using directive or an assembly reference?)
> 
> 
>