Be more tolerant and also accept <esi:include ...></esi:include>, also if it is not 100% standards compliant.

mpdude · mpdude · commit cae7db0d1929 · 2011-12-23T19:02:12.000+01:00
diff --git a/src/Symfony/Component/HttpKernel/HttpCache/Esi.php b/src/Symfony/Component/HttpKernel/HttpCache/Esi.php
@@ -154,8 +154,8 @@ public function process(Request $request, Response $response)
 
         // we don't use a proper XML parser here as we can have ESI tags in a plain text response
         $content = $response->getContent();
-        $content = preg_replace_callback('#<esi\:include\s+(.*?)\s*/>#', array($this, 'handleEsiIncludeTag'), $content);
-        $content = preg_replace('#<esi\:comment[^>]*/>#', '', $content);
+        $content = preg_replace_callback('#<esi\:include\s+(.*?)\s*(?:/|</esi\:include)>#', array($this, 'handleEsiIncludeTag'), $content);
+        $content = preg_replace('#<esi\:comment[^>]*(?:/|</esi\:comment)>#', '', $content);
         $content = preg_replace('#<esi\:remove>.*?</esi\:remove>#', '', $content);
 
         $response->setContent($content);
