Merge pull request #296 from hmrc/PLATUI-2703

PLATUI-2703 add caching to hmrc-frontend assets

CHANGELOG.md

@@ -8,6 +8,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 For compatibility information see `govukFrontendVersion` and `hmrcFrontendVersion` in
 [LibDependencies](project/LibDependencies.scala)
 
+## [9.6.1] - 2024-04-15
+
+### Changed
+
+- Added in caching with a max-age of 60 minutes for hmrc-frontend resources
+
 ## [9.6.0] - 2024-04-10
 
 ### Changed

it-play-30/src/test/scala/uk/gov/hmrc/hmrcfrontend/controllers/AssetsSpec.scala

@@ -1,5 +1,5 @@
 /*
- * Copyright 2023 HM Revenue & Customs
+ * Copyright 2024 HM Revenue & Customs
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,6 +18,7 @@ package uk.gov.hmrc.hmrcfrontend.controllers
 
 import org.scalatest.TestData
 import org.scalatest.matchers.must.Matchers
+import org.scalatest.matchers._
 import org.scalatest.wordspec.AnyWordSpec
 import org.scalatestplus.play.guice.GuiceOneAppPerTest
 import play.api.Application
@@ -38,5 +39,16 @@ class AssetsSpec extends AnyWordSpec with Matchers with Results with GuiceOneApp
       status(route(app, FakeRequest("GET", "/assets/all.js")).get) must be(200)
     }
   }
+  "Asset controller " must {
+    "serve assets with correct cache-control headers" in {
+    val cacheControlHeader = header("Cache-Control", route(app, FakeRequest("GET", "/assets/all.js")).get)
+    cacheControlHeader match {
+      case Some(headerValue) =>
+        headerValue must include("max-age=3600")
+      case None =>
+        fail("Cache-Control header not found")
+      }
+    }
+  }
 
 }

play-frontend-hmrc-play-30/src/main/resources/reference.conf

@@ -82,6 +82,9 @@ pta-account-menu {
 
 language.fallback.url = "https://www.gov.uk/government/organisations/hm-revenue-customs"
 
+# Cache set to 60 minutes for hmrc-frontend assets
+play.assets.cache."/public/lib/hmrc-frontend/"="public, max-age=3600"
+
 # used to enable A/B testing experiments from the experimentation team
 optimizely.url = "https://cdn.optimizely.com/js/"
 optimizely.projectId = null