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-rw-r--r--actionpack/lib/action_dispatch/http/mime_negotiation.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/http/mime_negotiation.rb b/actionpack/lib/action_dispatch/http/mime_negotiation.rb
index 346598b6de..c33ba201e1 100644
--- a/actionpack/lib/action_dispatch/http/mime_negotiation.rb
+++ b/actionpack/lib/action_dispatch/http/mime_negotiation.rb
@@ -50,7 +50,7 @@ module ActionDispatch
# GET /posts/5 | request.format => Mime::HTML or MIME::JS, or request.accepts.first
#
def format(view_path = [])
- formats.first
+ formats.first || Mime::NullType.instance
end
def formats