Configure cache headers for Grails controllers

grails-cache-headers

/*
 * Setting cache headers appropriately is both a performance issue and is necessary 
 * to avoid a slew of bugs from when files or data change over time.
 *
 * For this example, I'm using the Grails cache-headers plugin:
 * http://grails.org/plugin/cache-headers
 */

/*
 * First, we've designated two cache categories in the Config.groovy.  This lets us centralize configuration
 * and set environment-specific settings later.
 */
cache.headers.presets = [
  never: false, //don't cache
  reference: [shared:true, validFor: 3600] // store rarely-changing reference data for one hour
]

/*
 * Then we can tell any controller method to use one of the above strategies:
 */ 
def doNotCacheMe() {
  cache "never"
  render whatever as JSON
}

def cacheMeForAWhile() {
  cache "reference"
  render whatever as JSON
}