The Grails Framework 2.4.4

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(Quick Reference) # url ## Purpose To validate that a `String` value is a valid URL. ## Examples
    homePage url: true
## Description Set to `true` if a string value must be a URL. Internally uses the `org.apache.commons.validator.UrlValidator` class. Error Code: `className.propertyName.url.invalid` | Quick Reference (hide)