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-rw-r--r--actionpack/lib/action_dispatch/http/headers.rb4
1 files changed, 3 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/http/headers.rb b/actionpack/lib/action_dispatch/http/headers.rb
index 3c03976f03..6c7d24d2d0 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.
@@ -119,7 +121,7 @@ module ActionDispatch
# not contained within the headers hash.
def env_name(key)
key = key.to_s
- if key =~ HTTP_HEADER
+ if HTTP_HEADER.match?(key)
key = key.upcase.tr("-", "_")
key = "HTTP_" + key unless CGI_VARIABLES.include?(key)
end