Grails Goodness: Using the header Method to Set Response Headers

Grails adds a couple of methods and properties to our controller classes automatically. One of the methods is the header() method. With this method we can set a response header with a name and value. The methods accepts two arguments: the first argument is the header name and the second argument is the header value.

In the following controller we invoke the header() method to set the header X-Powered-By with the Grails and Groovy version.

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package header.ctrl   class SampleController {       def grailsApplication       def index() {         final String grailsVersion = grailsApplication.metadata.getGrailsVersion()         final String groovyVersion = GroovySystem.version         header 'X-Powered-By', "Grails: $grailsVersion, Groovy: $groovyVersion"     }   }

We can test this with the following Spock specification:

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package header.ctrl   import grails.test.mixin.TestFor import spock.lang.Specification   @TestFor(SampleController) class SampleControllerSpec extends Specification {       def "index must set response header X-Powered-By with value"() {         when:         controller.index()           then:         response.headerNames.contains 'X-Powered-By'         response.header('X-Powered-By') == 'Grails: 2.2.4, Groovy: 2.0.8'     }   }

Code written with Grails 2.2.4