From 87d83ab4c6c7daaeb41645a923959220edc6f2c2 Mon Sep 17 00:00:00 2001
From: Danijel <danijel@martinek.xyz>
Date: Wed, 18 Mar 2026 02:17:56 +0100
Subject: [PATCH] fix: store session after handleRequest so sessionId is
 initialized

transport.sessionId is only populated during handleRequest(), not
before. Reading it before that call stored sessions under key
`undefined`, causing all subsequent requests to get "Session not found."

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 src/http-server.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/http-server.ts b/src/http-server.ts
index fd782ea..efb6906 100644
--- a/src/http-server.ts
+++ b/src/http-server.ts
@@ -134,14 +134,14 @@ const httpServer = http.createServer(async (req, res) => {
         const mcpServer = await createServer(config);
         await mcpServer.connect(transport);
 
+        await transport.handleRequest(req, res, parsedBody);
+
         const sid = transport.sessionId!;
         sessions.set(sid, { transport, createdAt: Date.now() });
 
         transport.onclose = () => {
           sessions.delete(sid);
         };
-
-        await transport.handleRequest(req, res, parsedBody);
       } else {
         // Existing session
         const session = sessions.get(sessionId);