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-rw-r--r--actionpack/lib/action_controller/metal/mime_responds.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/metal/mime_responds.rb b/actionpack/lib/action_controller/metal/mime_responds.rb
index 2ac199265d..fa69ab2038 100644
--- a/actionpack/lib/action_controller/metal/mime_responds.rb
+++ b/actionpack/lib/action_controller/metal/mime_responds.rb
@@ -263,6 +263,7 @@ module ActionController #:nodoc:
if format = request.negotiate_mime(collector.order)
self.content_type ||= format.to_s
self.formats = [format.to_sym]
+ self.formats.freeze
collector.response_for(format)
else
head :not_acceptable