From d2fedde41ce85d309be5456aa28494774400ed90 Mon Sep 17 00:00:00 2001
From: Martin Zurowietz <martin@zurowietz.de>
Date: Wed, 11 Aug 2021 08:08:34 +0200
Subject: [PATCH] Fix HTTP header casing in existsRemote

---
 src/FileCache.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/FileCache.php b/src/FileCache.php
index 9b053c9..0247860 100644
--- a/src/FileCache.php
+++ b/src/FileCache.php
@@ -257,6 +257,7 @@ protected function existsRemote($file)
     {
         $context  = stream_context_create(['http' => ['method'=>'HEAD']]);
         $headers = get_headers($file->getUrl(), 1, $context);
+        $headers = array_change_key_case($headers, CASE_LOWER);
 
         $exists = explode(' ', $headers[0])[1][0] === '2';
 
@@ -265,14 +266,14 @@ protected function existsRemote($file)
         }
 
         if (!empty($this->config['mime_types'])) {
-            $type = trim(explode(';', $headers['Content-Type'])[0]);
+            $type = trim(explode(';', $headers['content-type'])[0]);
             if (!in_array($type, $this->config['mime_types'])) {
                 throw new Exception("MIME type '{$type}' not allowed.");
             }
         }
 
         $maxBytes = intval($this->config['max_file_size']);
-        $size = intval($headers['Content-Length']);
+        $size = intval($headers['content-length']);
 
         if ($maxBytes >= 0 && $size > $maxBytes) {
             throw new Exception("The file is too large with more than {$maxBytes} bytes.");