diff --git a/src/Publisher.php b/src/Publisher.php
index 06520914..4a8108f1 100644
--- a/src/Publisher.php
+++ b/src/Publisher.php
@@ -10,6 +10,7 @@
 use SilverStripe\Core\Config\Configurable;
 use SilverStripe\Core\CoreKernel;
 use SilverStripe\Core\Environment;
+use SilverStripe\Core\Extensible;
 use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\FieldType\DBDatetime;
@@ -22,6 +23,7 @@
 
 abstract class Publisher implements StaticPublisher
 {
+    use Extensible;
     use Injectable;
     use Configurable;
 
diff --git a/src/Publisher/FilesystemPublisher.php b/src/Publisher/FilesystemPublisher.php
index 63e0c49a..2cbab79c 100644
--- a/src/Publisher/FilesystemPublisher.php
+++ b/src/Publisher/FilesystemPublisher.php
@@ -109,7 +109,11 @@ public function publishURL($url, $forcePublish = false)
             return;
         }
         $success = false;
+
+        $this->extend('onBeforeGeneratePageResponse', $url);
         $response = $this->generatePageResponse($url);
+        $this->extend('onAfterGeneratePageResponse', $url, $response);
+
         $statusCode = $response->getStatusCode();
         $doPublish = ($forcePublish && $this->getFileExtension() === 'php') || $statusCode < 400;