RequestExtensions.cs

public static class RequestExtensions
{
    public static bool IsLocal(this Request request)
    {
        var remoteAddress = request.UserHostAddress;
        
        if (string.IsNullOrEmtpy(remoteAddress))
        {
            return false;
        }
        
        if (remoteAddress == "127.0.0.1" || remoteAddress == "::1")
        {
            return true;
        }
        
        // We don't have access to a local address, so we can't
        // check if localAddress == remoteAddress.
    }
}