I wrote this plugin (based on these instructions) but it doesn't work.

First of all I set RebuildOnAppStart =false in examinesettings.config, then I wrote this code:

// EXAMINE
using Examine;

// SYSTEM
using System;
using System.Web.Configuration;

// UMBRACO
using Umbraco.Web.Mvc;
using Umbraco.Web.WebApi;

namespace AF.UmbTasks.Plugins
{
    /// <summary>
    /// 
    /// </summary>
    [PluginController("Tasks")]
    public class ExamineController : UmbracoApiController
    {
        [System.Web.Http.HttpGet]
        public string ExamineIndexRebuild(string code)
        {
            if (WebConfigurationManager.AppSettings["AFTask_RebuildExamineIndex"] != null)
            {
                string examineIndexToRebuild = WebConfigurationManager.AppSettings["AFTask_RebuildExamineIndex"].ToString();

                try
                {
                    //validate the querystring
                    if (code.Equals(System.Configuration.ConfigurationManager.AppSettings["code"]))
                    {
                        ExamineManager.Instance.IndexProviderCollection[examineIndexToRebuild].RebuildIndex();

                        string successRebuildMessage = "Examine Index successfully rebuilded: " + examineIndexToRebuild;
                        Logger.Info(typeof(ExamineController), successRebuildMessage);
                    }
                }
                catch (Exception ex)
                {
                    string errorRebuildMessage = "Examine Index NOT rebuilded: " + examineIndexToRebuild;
                    Logger.Error(typeof(ExamineController), errorRebuildMessage, ex);
                }
            }

            return "complete";
        }
    }
}

When I try to access the URL "/Umbraco/Tasks/Examine/ExamineIndexRebuild?code=MyCodeForSecurity" of my website, the results is a blank xml page (see the attach file)

I don't understand if I must create my custom route (and how) and where I must configure the "code" key.

Can anyone help me? There is another way to create a task to rebuild the examine index?

Adriano