withForm {
   // good request
}.invalidToken {
   // bad request
}withForm
Purpose
Used to handle duplicate form submissions.
Examples
Description
The withForm method requires the use of the useToken attribute in a form
<g:form useToken="true" ...>Then in your controller code you can use the withForm method to handle valid and invalid requests:
withForm {
   // good request
}.invalidToken {
   // bad request
}See Handling Duplicate Form Submissions for more information.