FluentValidation abosolute uri validator rule builder

ValidatorExtension.cs

using FluentValidation;
using System;

public static class ValidatorExtension
{
      public static IRuleBuilderOptions<T, Uri> IsAbsoluteUri<T>(this IRuleBuilder<T, Uri> ruleBuilder) =>
          ruleBuilder.Must(setting => setting != null && setting.IsAbsoluteUri)
                     .WithMessage("Setting must be an absolute URI");
}