From e77521036b7f35dfc13aea415c246406ffacbd9c Mon Sep 17 00:00:00 2001
From: chentsulin <chentsulin@gmail.com>
Date: Thu, 26 Mar 2020 15:01:15 +0800
Subject: [PATCH] fix(Server): fix responding with application/json when using
 custom servers

---
 packages/bottender/src/server/Server.ts | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/packages/bottender/src/server/Server.ts b/packages/bottender/src/server/Server.ts
index fe060c672..6a1f47d7b 100644
--- a/packages/bottender/src/server/Server.ts
+++ b/packages/bottender/src/server/Server.ts
@@ -149,7 +149,16 @@ class Server {
               res.setHeader(key, value as string);
             });
             res.statusCode = response.status || 200;
-            res.end(response.body || '');
+            if (
+              response.body &&
+              typeof response.body === 'object' &&
+              !Buffer.isBuffer(response.body)
+            ) {
+              res.setHeader('Content-Type', 'application/json; charset=utf-8');
+              res.end(JSON.stringify(response.body));
+            } else {
+              res.end(response.body || '');
+            }
           } else {
             res.statusCode = 200;
             res.end('');