From 3061a9d7d5d1e73b3ea4c955aa4b6efd18f00153 Mon Sep 17 00:00:00 2001
From: Shish <shish@shishnet.org>
Date: Sat, 1 Jan 2022 10:29:32 +0000
Subject: [PATCH] avoid warning when HTTP_X_FORWARDED_PROTO isn't set

---
 core/util.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/util.php b/core/util.php
index 8b20139d..80a86894 100644
--- a/core/util.php
+++ b/core/util.php
@@ -66,7 +66,7 @@ function contact_link(): ?string
 function is_https_enabled(): bool
 {
     // check forwarded protocol
-    if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
+    if (!empty($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') {
         $_SERVER['HTTPS']='on';
     }
     return (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off');