From ad6ed3f4c835eb6a86ba61dadfd3896ddcbb48e3 Mon Sep 17 00:00:00 2001
From: Jeff Brooks <jeph.brooks@gmail.com>
Date: Tue, 15 Oct 2019 09:03:44 -0500
Subject: [PATCH] Implement check and exception for str type on value in
 Response process_headers method.

---
 gunicorn/http/wsgi.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gunicorn/http/wsgi.py b/gunicorn/http/wsgi.py
index b786bc09..3524471f 100644
--- a/gunicorn/http/wsgi.py
+++ b/gunicorn/http/wsgi.py
@@ -253,7 +253,8 @@ class Response(object):
             if HEADER_RE.search(name):
                 raise InvalidHeaderName('%r' % name)
 
-            value = str(value)
+            if not isinstance(value, str):
+                raise TypeError('%r is not a string' % value)
 
             if HEADER_VALUE_RE.search(value):
                 raise InvalidHeader('%r' % value)