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-rw-r--r--actionpack/lib/action_dispatch/http/cache.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/http/cache.rb b/actionpack/lib/action_dispatch/http/cache.rb
index f9b278349e..63a3cbc90b 100644
--- a/actionpack/lib/action_dispatch/http/cache.rb
+++ b/actionpack/lib/action_dispatch/http/cache.rb
@@ -92,7 +92,7 @@ module ActionDispatch
LAST_MODIFIED = "Last-Modified".freeze
ETAG = "ETag".freeze
CACHE_CONTROL = "Cache-Control".freeze
- SPECIAL_KEYS = %w[extras no-cache max-age public must-revalidate]
+ SPECIAL_KEYS = Set.new(%w[extras no-cache max-age public must-revalidate])
def cache_control_segments
if cache_control = self[CACHE_CONTROL]