public static IAdvancedHttpBuilder WithAcceptCharSet(this IAdvancedHttpBuilder builder, string charSet)

        {
            return(builder.WithHeadersConfiguration(h => h.AcceptCharset.Add(new StringWithQualityHeaderValue(charSet))));
        }
        public static IAdvancedHttpBuilder WithAcceptHeaderValue(this IAdvancedHttpBuilder builder, string mediaType)

        {
            return(builder.WithHeadersConfiguration(h => h.Accept.Add(new MediaTypeWithQualityHeaderValue(mediaType))));
        }