From a91142441b9f63586cc7be046ba08b157e969825 Mon Sep 17 00:00:00 2001
From: BadJacky <113529280+BadJacky@users.noreply.github.com>
Date: Tue, 8 Apr 2025 14:34:09 +0800
Subject: [PATCH] fix: update Response::getHeader parameter declaration

Update the parameter declaration in Response::getHeader method to use
string|null type instead of ?string with default value to avoid PHP 8.1+
deprecation warning while maintaining backward compatibility.

This resolves the warning:
"Implicitly marking parameter $name as nullable is deprecated, the explicit
nullable type must be used instead"
---
 src/Server/Response.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Server/Response.php b/src/Server/Response.php
index 59695dc..c4c07d2 100644
--- a/src/Server/Response.php
+++ b/src/Server/Response.php
@@ -123,7 +123,7 @@ public function removeHeader(string $name): static
      *
      * @return mixed
      */
-    public function getHeader(string $name = null): mixed
+    public function getHeader(null|string $name = null): mixed
     {
         if (!$name) {
             return $this->headers;