From f3ecb2ebd81690f7d2d10a21b51d5bc76d1f8c85 Mon Sep 17 00:00:00 2001
From: Ridwan Kasim <kasimsheyi20@gmail.com>
Date: Sun, 8 Feb 2026 15:58:13 +0100
Subject: [PATCH] [Server] Fix HTTP Transport Header Compliance (#227)

* fix: added the Allow header for bad method status code

* fix code style

---------

Co-authored-by: Tobias Nyholm <tobias.nyholm@gmail.com>
---
 src/Server/Transport/StreamableHttpTransport.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Server/Transport/StreamableHttpTransport.php b/src/Server/Transport/StreamableHttpTransport.php
index 2b1e686..24b2e10 100644
--- a/src/Server/Transport/StreamableHttpTransport.php
+++ b/src/Server/Transport/StreamableHttpTransport.php
@@ -242,6 +242,10 @@ class StreamableHttpTransport extends BaseTransport
             ->withHeader('Content-Type', 'application/json')
             ->withBody($this->streamFactory->createStream($payload));
 
+        if (405 === $statusCode) {
+            $response = $response->withHeader('Allow', 'POST, DELETE, OPTIONS');
+        }
+
         return $this->withCorsHeaders($response);
     }