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-rw-r--r--actionpack/lib/action_controller/metal/live.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_controller/metal/live.rb b/actionpack/lib/action_controller/metal/live.rb
index 083b762f5a..eb43ff9c63 100644
--- a/actionpack/lib/action_controller/metal/live.rb
+++ b/actionpack/lib/action_controller/metal/live.rb
@@ -146,7 +146,7 @@ module ActionController
def write(string)
unless @response.committed?
- @response.set_header "Cache-Control", "no-cache"
+ @response.headers["Cache-Control"] ||= "no-cache"
@response.delete_header "Content-Length"
end