12 files declare their use of HtmlResponse
- BigPipe.php in core/modules/ big_pipe/ src/ Render/ BigPipe.php 
- BigPipeResponse.php in core/modules/ big_pipe/ src/ Render/ BigPipeResponse.php 
- BigPipeResponseAttachmentsProcessor.php in core/modules/ big_pipe/ src/ Render/ BigPipeResponseAttachmentsProcessor.php 
- BigPipeResponseAttachmentsProcessorTest.php in core/modules/ big_pipe/ tests/ src/ Unit/ Render/ BigPipeResponseAttachmentsProcessorTest.php 
- BigPipeTestSubscriber.php in core/modules/ big_pipe/ tests/ modules/ big_pipe_test/ src/ EventSubscriber/ BigPipeTestSubscriber.php 
- CustomPageExceptionHtmlSubscriberTest.php in core/tests/ Drupal/ Tests/ Core/ EventSubscriber/ CustomPageExceptionHtmlSubscriberTest.php 
- HtmlRenderer.php in core/lib/ Drupal/ Core/ Render/ MainContent/ HtmlRenderer.php 
- HtmlResponseBigPipeSubscriber.php in core/modules/ big_pipe/ src/ EventSubscriber/ HtmlResponseBigPipeSubscriber.php 
- HtmlResponsePlaceholderStrategySubscriber.php in core/lib/ Drupal/ Core/ EventSubscriber/ HtmlResponsePlaceholderStrategySubscriber.php 
- HtmlResponseSubscriber.php in core/lib/ Drupal/ Core/ EventSubscriber/ HtmlResponseSubscriber.php 
- ManyPlaceholderTest.php in core/modules/ big_pipe/ tests/ src/ Unit/ Render/ ManyPlaceholderTest.php 
- OEmbedIframeController.php in core/modules/ media/ src/ Controller/ OEmbedIframeController.php 
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