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-rw-r--r--actionpack/lib/action_dispatch/http/headers.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/http/headers.rb b/actionpack/lib/action_dispatch/http/headers.rb
index 3c03976f03..c3c2a9d8c5 100644
--- a/actionpack/lib/action_dispatch/http/headers.rb
+++ b/actionpack/lib/action_dispatch/http/headers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
module ActionDispatch
module Http
# Provides access to the request's HTTP headers from the environment.