From 5ad9b269708374583ecb2c4aeb82dc2d1d6453a2 Mon Sep 17 00:00:00 2001
From: Kirill Nesmeyanov <nesk@xakep.ru>
Date: Sun, 12 Sep 2021 00:20:58 +0300
Subject: [PATCH] Force cast headers key to string

---
 src/PSR7Worker.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/PSR7Worker.php b/src/PSR7Worker.php
index ab2c865..6a74bdc 100644
--- a/src/PSR7Worker.php
+++ b/src/PSR7Worker.php
@@ -134,7 +134,7 @@ protected function configureServer(Request $request): array
 
         $server['HTTP_USER_AGENT'] = '';
         foreach ($request->headers as $key => $value) {
-            $key = \strtoupper(\str_replace('-', '_', $key));
+            $key = \strtoupper(\str_replace('-', '_', (string)$key));
             if (\in_array($key, ['CONTENT_TYPE', 'CONTENT_LENGTH'])) {
                 $server[$key] = \implode(', ', $value);
             } else {