From e483b919163cd0c1a7bea96bd7d192c2f7900163 Mon Sep 17 00:00:00 2001
From: webzwo0i <webzwo0i@c3d2.de>
Date: Sun, 4 Apr 2021 16:17:11 +0200
Subject: [PATCH] Don't make browsers fail on sync-xhr until require-kernel is
 dropped

---
 src/node/hooks/express/specialpages.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/node/hooks/express/specialpages.js b/src/node/hooks/express/specialpages.js
index 61471348d..c1e3fec99 100644
--- a/src/node/hooks/express/specialpages.js
+++ b/src/node/hooks/express/specialpages.js
@@ -54,6 +54,8 @@ exports.expressCreateServer = (hookName, args, cb) => {
       isReadOnly,
     });
 
+    // can be removed when require-kernel is dropped
+    res.header('Feature-Policy', 'sync-xhr \'self\'');
     res.send(eejs.require('ep_etherpad-lite/templates/pad.html', {
       req,
       toolbar,