fix[web]: fix ignoring quality=0 values in Accept-Language

`Accept-Language: en-US; q=0, de-DE; q=0.5` means that english MUST not
be selected.

diff --git a/tornado/web.py b/tornado/web.py
index b3efce998e7630a147119190ad364ffe80b8803c..8cbb2b43be35afff9b4bc9f66bc4a28443843721 100644 (file)
--- a/tornado/web.py
+++ b/tornado/web.py
@@ -1293,7 +1293,8 @@ class RequestHandler(object):
                         score = 0.0
                 else:
                     score = 1.0
-                locales.append((parts[0], score))
+                if score > 0:
+                    locales.append((parts[0], score))
             if locales:
                 locales.sort(key=lambda pair: pair[1], reverse=True)
                 codes = [loc[0] for loc in locales]