core/lib/Drupal/Core/Routing/MethodFilter.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/lib/Drupal/Core/Routing/MethodFilter.php b/core/lib/Drupal/Core/Routing/MethodFilter.php
index d4687c3..64b8048 100644
--- a/core/lib/Drupal/Core/Routing/MethodFilter.php
+++ b/core/lib/Drupal/Core/Routing/MethodFilter.php
@@ -27,6 +27,11 @@ public function filter(RouteCollection $collection, Request $request) {
 
     foreach ($collection->all() as $name => $route) {
       $supported_methods = $route->getMethods();
+      // If the GET method is allowed we also need to allow the HEAD method
+      // since HEAD is a GET method that doesn't return the body.
+      if (in_array('GET', $supported_methods)) {
+        $supported_methods[] = 'HEAD';
+      }
 
       // A route not restricted to specific methods allows any method. If this
       // is the case, we'll also have at least one route left in the collection,