diff --git a/base-server/index.js b/base-server/index.js
index 5408399..fe64dcd 100644
--- a/base-server/index.js
+++ b/base-server/index.js
@@ -628,6 +628,7 @@ export class BaseServer {
         if (this.destroying) {
           res.writeHead(503, { 'Content-Type': 'text/plain' })
           res.end('The server is shutting down\n')
+          return
         }
 
         let urlString = req.url
diff --git a/base-server/index.test.ts b/base-server/index.test.ts
index 2962176..bb5f111 100644
--- a/base-server/index.test.ts
+++ b/base-server/index.test.ts
@@ -1712,6 +1712,10 @@ it('waits until all HTTP processing ends', async () => {
   await setTimeout(100)
   expect(destroyed).toBe(false)
 
+  expect((await requestError(app, 'POST', '/a')).message).toEqual(
+    'The server is shutting down\n'
+  )
+
   resolveA!()
   await setTimeout(100)
   expect(destroyed).toBe(false)