8.3.3 Redirects In URL Mappings
Since Grails 2.3, it is possible to define URL mappings which specify a redirect.When a URL mapping specifies a redirect, any time that mapping matches an incomingrequest, a redirect is initiated with information provided by the mapping.
When a URL mapping specifies a redirect the mapping must either supply a Stringrepresenting a URI to redirect to or must provide a Map representing the targetof the redirect. That Map is structured just like the Map that may be passedas an argument to the redirect
method in a controller.
"/viewBooks"(redirect: '/books/list')
"/viewAuthors"(redirect: [controller: 'author', action: 'list'])
"/viewPublishers"(redirect: [controller: 'publisher', action: 'list', permanent: true])
Request parameters that were part of the original request will be included in the redirect.