From 3666a584fd24dc14585648f215a82ce1e8b71baa Mon Sep 17 00:00:00 2001
From: Jesse Roberts <jesse@clearwateranalytics.com>
Date: Fri, 27 Apr 2018 11:05:37 -0600
Subject: [PATCH] fix #2736 - allow lists to be passed through to
 response_class init

---
 flask/app.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/flask/app.py b/flask/app.py
index c482484b..2de526e2 100644
--- a/flask/app.py
+++ b/flask/app.py
@@ -1923,7 +1923,7 @@ class Flask(_PackageBoundObject):
         status = headers = None
 
         # unpack tuple returns
-        if isinstance(rv, (tuple, list)):
+        if isinstance(rv, tuple):
             len_rv = len(rv)
 
             # a 3-tuple is unpacked directly