From 9dca358d2c99a09b8da697486e5dec87a04b4f95 Mon Sep 17 00:00:00 2001
From: gus <gustavoraularagon@gmail.com>
Date: Mon, 30 Mar 2026 22:02:41 -0300
Subject: [PATCH] fix(a2a-server): add missing return after 501 in
 /tasks/metadata endpoint

The handler sends a 501 when the task store is not InMemoryTaskStore
but does not return. Execution falls through to the try block which
sends a second response, triggering ERR_HTTP_HEADERS_SENT and crashing
the server.

Fixes #21729
---
 packages/a2a-server/src/http/app.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/a2a-server/src/http/app.ts b/packages/a2a-server/src/http/app.ts
index 35ca48949f4..3b2e7443d04 100644
--- a/packages/a2a-server/src/http/app.ts
+++ b/packages/a2a-server/src/http/app.ts
@@ -326,6 +326,7 @@ export async function createApp() {
           error:
             'Listing all task metadata is only supported when using InMemoryTaskStore.',
         });
+        return;
       }
       try {
         const wrappers = agentExecutor.getAllTasks();