This is from a guest lecture that I delivered to a web-programming class at Bethel University this past month.

Brief Introduction to REST

Grails Supports REST in various ways: Exposing resources in URL Mappings:

static mappings = { "/product/$id?"(resource:"product") }

Or specifically mapping HTTP Methods to actions

"/product/$id"(controller:"product"){ action = [GET:"show", PUT:"update", DELETE:"delete", POST:"save"] }

Also checkout my post on overriding the HTTP Method with Grails or a more in-depth look at RESTful Grails.