public static IApplicationBuilder UseSendFile(
            this IApplicationBuilder builder, string filePath)
        {
            var options = new SendFileMiddlewareOptions()
            {
                FilePath = filePath
            };

            return
                (builder.UseMiddleware <SendFileMiddleware>(Options.Create(options)));
        }
 public static IApplicationBuilder UseSendFile(
     this IApplicationBuilder builder, SendFileMiddlewareOptions options)
 {
     return
         (builder.UseMiddleware <SendFileMiddleware>(Options.Create(options)));
 }