diff --git a/core/modules/views/src/Plugin/views/display/Feed.php b/core/modules/views/src/Plugin/views/display/Feed.php
index 16d40813005a7bb57b53f7a8250137188aac8599..caf6f8cbc92f99c27edf3ba97e7d03f5f97108be 100644
--- a/core/modules/views/src/Plugin/views/display/Feed.php
+++ b/core/modules/views/src/Plugin/views/display/Feed.php
@@ -116,9 +116,47 @@ public static function buildResponse($view_id, $display_id, array $args = []) {
$cache_metadata = CacheableMetadata::createFromRenderArray($build);
$response->addCacheableDependency($cache_metadata);
+ // Set the HTTP headers and status code on the response if any bubbled.
+ if (!empty($build['#attached']['http_header'])) {
+ static::setHeaders($response, $build['#attached']['http_header']);
+ }
+
return $response;
}
+ /**
+ * Sets headers on a response object.
+ *
+ * @param \Drupal\Core\Cache\CacheableResponse $response
+ * The HTML response to update.
+ * @param array $headers
+ * The headers to set, as an array. The items in this array should be as
+ * follows:
+ * - The header name.
+ * - The header value.
+ * - (optional) Whether to replace a current value with the new one, or add
+ * it to the others. If the value is not replaced, it will be appended,
+ * resulting in a header like this: 'Header: value1,value2'.
+ *
+ * @see \Drupal\Core\Render\HtmlResponseAttachmentsProcessor::setHeaders()
+ */
+ protected static function setHeaders(CacheableResponse $response, array $headers): void {
+ foreach ($headers as $values) {
+ $name = $values[0];
+ $value = $values[1];
+ $replace = !empty($values[2]);
+
+ // Drupal treats the HTTP response status code like a header, even though
+ // it really is not.
+ if (strtolower($name) === 'status') {
+ $response->setStatusCode($value);
+ }
+ else {
+ $response->headers->set($name, $value, $replace);
+ }
+ }
+ }
+
/**
* {@inheritdoc}
*/
diff --git a/core/modules/views/src/Plugin/views/style/Opml.php b/core/modules/views/src/Plugin/views/style/Opml.php
index ad8c30dfe6cba0192d28637b9daf0a6b301e9add..e59051dba68d433753ec24a139b8e752cec5022b 100644
--- a/core/modules/views/src/Plugin/views/style/Opml.php
+++ b/core/modules/views/src/Plugin/views/style/Opml.php
@@ -67,6 +67,11 @@ public function render() {
'#view' => $this->view,
'#options' => $this->options,
'#rows' => $rows,
+ '#attached' => [
+ 'http_header' => [
+ ['Content-Type', 'text/xml; charset=utf-8'],
+ ],
+ ],
];
unset($this->view->row_index);
return $build;
diff --git a/core/modules/views/src/Plugin/views/style/Rss.php b/core/modules/views/src/Plugin/views/style/Rss.php
index f8973550643f65df28878ddad1e5f17945342757..51394feda329fc29d3013b1d168c680aad8d7164 100644
--- a/core/modules/views/src/Plugin/views/style/Rss.php
+++ b/core/modules/views/src/Plugin/views/style/Rss.php
@@ -132,6 +132,11 @@ public function render() {
'#view' => $this->view,
'#options' => $this->options,
'#rows' => $rows,
+ '#attached' => [
+ 'http_header' => [
+ ['Content-Type', 'application/rss+xml; charset=utf-8'],
+ ],
+ ],
];
unset($this->view->row_index);
return $build;
diff --git a/core/modules/views/tests/src/Functional/Plugin/DisplayFeedTest.php b/core/modules/views/tests/src/Functional/Plugin/DisplayFeedTest.php
index f2510c690bf870d5c3f30119c0aa5d1427f59df7..6b6dd74019f2bdbe13a5f6b8a63e585b139d8048 100644
--- a/core/modules/views/tests/src/Functional/Plugin/DisplayFeedTest.php
+++ b/core/modules/views/tests/src/Functional/Plugin/DisplayFeedTest.php
@@ -204,4 +204,38 @@ public function testDisabledLinkedDisplay() {
$this->assertSession()->statusCodeEquals(200);
}
+ /**
+ * Tests the cacheability of the feed display.
+ */
+ public function testFeedCacheability(): void {
+ // Test as an anonymous user.
+ $this->drupalLogout();
+
+ // Set the page cache max age to a value greater than zero.
+ $config = $this->config('system.performance');
+ $config->set('cache.page.max_age', 300);
+ $config->save();
+
+ // Uninstall all page cache modules that could cache the HTTP response
+ // headers.
+ \Drupal::service('module_installer')->uninstall([
+ 'page_cache',
+ 'dynamic_page_cache',
+ ]);
+
+ // Reset all so that the config and module changes are active.
+ $this->resetAll();
+
+ $url = 'test-feed-display.xml';
+ $this->drupalGet($url);
+ $this->assertSession()->statusCodeEquals(200);
+ $this->assertSession()->responseHeaderEquals('Cache-Control', 'max-age=300, public');
+ $this->assertSession()->responseHeaderEquals('Content-Type', 'application/rss+xml; charset=utf-8');
+
+ // Visit the page again to get the cached response.
+ $this->drupalGet($url);
+ $this->assertSession()->responseHeaderEquals('Cache-Control', 'max-age=300, public');
+ $this->assertSession()->responseHeaderEquals('Content-Type', 'application/rss+xml; charset=utf-8');
+ }
+
}
diff --git a/core/modules/views/views.theme.inc b/core/modules/views/views.theme.inc
index be6bfee2e4b9c9ec0c0a750259072cf9d565a22c..e048c714739028ce24a083a0f9d41a895c6095cb 100644
--- a/core/modules/views/views.theme.inc
+++ b/core/modules/views/views.theme.inc
@@ -928,12 +928,6 @@ function template_preprocess_views_view_rss(&$variables) {
$variables['namespaces'] = new Attribute($style->namespaces);
$variables['items'] = $items;
$variables['channel_elements'] = $style->channel_elements;
-
- // During live preview we don't want to output the header since the contents
- // of the feed are being displayed inside a normal HTML page.
- if (empty($variables['view']->live_preview)) {
- $variables['view']->getResponse()->headers->set('Content-Type', 'application/rss+xml; charset=utf-8');
- }
}
/**
@@ -995,12 +989,6 @@ function template_preprocess_views_view_opml(&$variables) {
$variables['title'] = $title;
$variables['items'] = $items;
$variables['updated'] = gmdate(DATE_RFC2822, \Drupal::time()->getRequestTime());
-
- // During live preview we don't want to output the header since the contents
- // of the feed are being displayed inside a normal HTML page.
- if (empty($variables['view']->live_preview)) {
- $variables['view']->getResponse()->headers->set('Content-Type', 'text/xml; charset=utf-8');
- }
}
/**