remove setContentLengthHeader for now

core/lib/Drupal/Core/EventSubscriber/FinishResponseSubscriber.php

@@ -325,10 +325,8 @@ public static function getSubscribedEvents(): array {
     // There is no specific reason for choosing 16 beside it should be executed
     // before ::onRespond().
     $events[KernelEvents::RESPONSE][] = ['onAllResponds', 16];
-    // Run very late, after all other response subscribers have run. However,
-    // any response subscribers that convert a response to a streamed response
-    // must run after this and undo what this does.
-    $events[KernelEvents::RESPONSE][] = ['setContentLengthHeader', -1024];
+    // @todo Removing call to setContentLengthHeader. This will need to be fixed
+    //   before commit. See https://drupal.org/i/3392196.
     return $events;
   }