From d87d8e5f7a426409565d1a008b8231c793ec61ef Mon Sep 17 00:00:00 2001
From: Pooya Parsa <pyapar@gmail.com>
Date: Thu, 19 Nov 2020 18:44:56 +0100
Subject: [PATCH] fix: stop middleware when writableEnded flag is set

---
 src/app.ts             | 4 ++++
 test/fixture/server.js | 1 +
 2 files changed, 5 insertions(+)

diff --git a/src/app.ts b/src/app.ts
index 9fa6ee57..d1614302 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -21,6 +21,10 @@ export function createApp (): App {
 
       const val = await layer.handle(req, res)
 
+      if (res.writableEnded) {
+        break
+      }
+
       const type = typeof val
       if (type === 'string') {
         send(res, val, MIMES.html)
diff --git a/test/fixture/server.js b/test/fixture/server.js
index 22ef5ffd..f788238d 100644
--- a/test/fixture/server.js
+++ b/test/fixture/server.js
@@ -14,6 +14,7 @@ const app = createApp()
 
 app.use('/api/hello', req => ({ url: req.url }))
 app.use('/api/express', createExpress())
+app.use('/api', (_req, res) => { res.end('API root') })
 app.use('/', () => 'Hello world!')
 
 const port = process.env.PORT || 3000