Rundeck webhook did not work with my setup. Somehow, Rundeck webhook is not working whatever changes I've done with Jenkins.
As an alternative, I used Jenkin's build trigger : Generic Webhook Trigger plugin. It works when my Rundeck jobs completed Succesfully.
https://wiki.jenkins.io/display/JENKINS/Generic+Webhook+Trigger+Plugin
Example below:
http://jenkins-url/generic-webhook-trigger/invoke?token=your-token