diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..ab1f416
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,10 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/
diff --git a/src/Adapters/Laravel/Http/Middleware/InjectJavascriptLibrary.php b/src/Adapters/Laravel/Http/Middleware/InjectJavascriptLibrary.php
index a3e8f93..b298ec3 100644
--- a/src/Adapters/Laravel/Http/Middleware/InjectJavascriptLibrary.php
+++ b/src/Adapters/Laravel/Http/Middleware/InjectJavascriptLibrary.php
@@ -33,7 +33,7 @@ public function handle(Request $request, Closure $next): Response
         /** @var Response $response */
         $response = $next($request);
 
-        if ($response->headers->get('Content-Type') === 'text/html; charset=UTF-8') {
+        if (strtolower($response->headers->get('Content-Type') ?? '') === 'text/html; charset=utf-8') {
             $content = (string) $response->getContent();
 
             if (! str_contains($content, '</html>') || ! str_contains($content, '</body>')) {