From fde2b0c3c40a037c118dad814c9226310637b5e5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ruben=20R=C3=B6gels?= <ruben.roegels@jumping-frog.org>
Date: Tue, 16 Mar 2021 17:59:55 +0100
Subject: [PATCH] Responses with HTTP status 204 or 304 must not have set the
 Content-Type header.

---
 View/ViewHandler.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/View/ViewHandler.php b/View/ViewHandler.php
index 6e638fbb2..6d63ab6ce 100644
--- a/View/ViewHandler.php
+++ b/View/ViewHandler.php
@@ -189,7 +189,7 @@ public function createResponse(View $view, Request $request, string $format): Re
 
         $response = $this->initResponse($view, $format);
 
-        if (!$response->headers->has('Content-Type')) {
+        if (!$response->headers->has('Content-Type') && !in_array($response->getStatusCode(), [204, 304])) {
             $mimeType = $request->attributes->get('media_type');
             if (null === $mimeType) {
                 $mimeType = $request->getMimeType($format);