From ba2173a10d6578c40f85dcca3bb0314ad7b84963 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Fri, 21 Aug 2015 16:43:01 -0700
Subject: use `set_header` rather than []=

This allows us to avoid calling `env_name` twice.
---
 actionpack/lib/action_dispatch/http/headers.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'actionpack/lib/action_dispatch/http/headers.rb')

diff --git a/actionpack/lib/action_dispatch/http/headers.rb b/actionpack/lib/action_dispatch/http/headers.rb
index 05191ff2fd..ca6cf339ed 100644
--- a/actionpack/lib/action_dispatch/http/headers.rb
+++ b/actionpack/lib/action_dispatch/http/headers.rb
@@ -82,7 +82,7 @@ module ActionDispatch
       # <tt>headers_or_env</tt>.
       def merge!(headers_or_env)
         headers_or_env.each do |key, value|
-          self[env_name(key)] = value
+          @req.set_header env_name(key), value
         end
       end
 
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