From e37e0df899a3c659fa0782f738e5b87fc71794e3 Mon Sep 17 00:00:00 2001
From: Florian Festi <florian@festi.info>
Date: Sun, 18 Aug 2019 13:56:04 +0200
Subject: [PATCH] Make a copy of the header list

---
 scripts/boxesserver | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/boxesserver b/scripts/boxesserver
index fce6e55..4d677c5 100755
--- a/scripts/boxesserver
+++ b/scripts/boxesserver
@@ -428,7 +428,7 @@ b"""
 
             http_headers = box.formats.http_headers.get(
                 box.format,
-                [('Content-type', 'application/unknown; charset=utf-8')])
+                [('Content-type', 'application/unknown; charset=utf-8')])[:]
 
             if box.format != "svg":
                 extension = box.format