From 4b21e2d38ccf66f236c5f1c8a10bd9d7904f2599 Mon Sep 17 00:00:00 2001
From: Massimo Santini <santini@dsi.unimi.it>
Date: Wed, 13 Jun 2012 16:43:34 +0300
Subject: [PATCH] I think it should check that cache_timeout is not None to
 allow for a (I hope legale) value of 0 for such parameter.

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

diff --git a/flask/helpers.py b/flask/helpers.py
index 72a961a8..18502a53 100644
--- a/flask/helpers.py
+++ b/flask/helpers.py
@@ -533,7 +533,7 @@ def send_file(filename_or_fp, mimetype=None, as_attachment=False,
     rv.cache_control.public = True
     if cache_timeout is None:
         cache_timeout = current_app.get_send_file_max_age(filename)
-    if cache_timeout:
+    if cache_timeout is not None:
         rv.cache_control.max_age = cache_timeout
         rv.expires = int(time() + cache_timeout)