11 files declare their use of CacheableResponse
- DefaultExceptionSubscriber.php in core/modules/ serialization/ src/ EventSubscriber/ DefaultExceptionSubscriber.php 
- DefaultFormatTestController.php in core/modules/ system/ tests/ modules/ default_format_test/ src/ DefaultFormatTestController.php 
- DynamicPageCacheTestController.php in core/modules/ dynamic_page_cache/ tests/ dynamic_page_cache_test/ src/ DynamicPageCacheTestController.php 
- Feed.php in core/modules/ views/ src/ Plugin/ views/ display/ Feed.php 
- PageCacheAcceptHeaderController.php in core/modules/ system/ tests/ modules/ system_test/ src/ Controller/ PageCacheAcceptHeaderController.php 
- ResourceResponseSubscriber.php in core/modules/ jsonapi/ src/ EventSubscriber/ ResourceResponseSubscriber.php 
- ResourceResponseSubscriber.php in core/modules/ rest/ src/ EventSubscriber/ ResourceResponseSubscriber.php 
- RestExport.php in core/modules/ rest/ src/ Plugin/ views/ display/ RestExport.php 
- SystemTestController.php in core/modules/ system/ tests/ modules/ system_test/ src/ Controller/ SystemTestController.php 
- TestControllers.php in core/modules/ system/ tests/ modules/ router_test_directory/ src/ TestControllers.php 
- VocabularyResponse.php in core/modules/ taxonomy/ tests/ modules/ vocabulary_serialization_test/ src/ VocabularyResponse.php 
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