24 files declare their use of CacheableResponseInterface in Drupal 9

AnonymousUserResponseSubscriber.php in core/lib/Drupal/Core/EventSubscriber/AnonymousUserResponseSubscriber.php

CacheableResourceResponse.php in core/modules/jsonapi/src/CacheableResourceResponse.php

CacheableSecuredRedirectResponse.php in core/lib/Drupal/Core/Routing/CacheableSecuredRedirectResponse.php

CacheableTestResponse.php in core/modules/system/tests/modules/early_rendering_controller_test/src/CacheableTestResponse.php

ClientErrorResponseSubscriber.php in core/lib/Drupal/Core/EventSubscriber/ClientErrorResponseSubscriber.php

CommentController.php in core/modules/comment/src/Controller/CommentController.php

DefaultExceptionHtmlSubscriber.php in core/lib/Drupal/Core/EventSubscriber/DefaultExceptionHtmlSubscriber.php

DynamicPageCacheSubscriber.php in core/modules/dynamic_page_cache/src/EventSubscriber/DynamicPageCacheSubscriber.php

EarlyRenderingControllerWrapperSubscriber.php in core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php

EntityResource.php in core/modules/jsonapi/src/Controller/EntityResource.php

EntityResource.php in core/modules/rest/src/Plugin/rest/resource/EntityResource.php

EntityResourceTestBase.php in core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php

FinishResponseSubscriber.php in core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php

HtmlResponse.php in core/lib/Drupal/Core/Render/HtmlResponse.php

MainContentViewSubscriber.php in core/lib/Drupal/Core/EventSubscriber/MainContentViewSubscriber.php

PageCache.php in core/modules/page_cache/src/StackMiddleware/PageCache.php

RequestHandler.php in core/modules/rest/src/RequestHandler.php

ResourceResponse.php in core/modules/rest/src/ResourceResponse.php

ResourceResponseSubscriber.php in core/modules/jsonapi/src/EventSubscriber/ResourceResponseSubscriber.php

ResourceResponseSubscriber.php in core/modules/rest/src/EventSubscriber/ResourceResponseSubscriber.php

ResourceResponseSubscriberTest.php in core/modules/rest/tests/src/Unit/EventSubscriber/ResourceResponseSubscriberTest.php

ResourceTestBase.php in core/modules/jsonapi/tests/src/Functional/ResourceTestBase.php

RouteAccessResponseSubscriber.php in core/lib/Drupal/Core/EventSubscriber/RouteAccessResponseSubscriber.php

TrustedRedirectResponseTest.php in core/tests/Drupal/Tests/Core/Routing/TrustedRedirectResponseTest.php