Update simpleStreamableHttp.ts

Author: ochafik

src/examples/server/simpleStreamableHttp.ts

@@ -280,7 +280,7 @@ app.use(express.json());
 let authMiddleware = null;
 if (useOAuth) {
   // Create auth middleware for MCP endpoints
-  const mcpServerUrl = new URL(`http://localhost:${MCP_PORT}`);
+  const mcpServerUrl = new URL(`http://localhost:${MCP_PORT}/mcp`);
   const authServerUrl = new URL(`http://localhost:${AUTH_PORT}`);
 
   const oauthMetadata: OAuthMetadata = setupAuthServer(authServerUrl, mcpServerUrl);