2 files changed, 8 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/http/cache.rb b/actionpack/lib/action_dispatch/http/cache.rb
index 30ade14c26..842dfa5827 100644
--- a/actionpack/lib/action_dispatch/http/cache.rb
+++ b/actionpack/lib/action_dispatch/http/cache.rb
@@ -91,7 +91,7 @@ module ActionDispatch
 
         DATE          = 'Date'.freeze
         LAST_MODIFIED = "Last-Modified".freeze
-        SPECIAL_KEYS  = Set.new(%w[extras no-cache max-age public must-revalidate])
+        SPECIAL_KEYS  = Set.new(%w[extras no-cache max-age public private must-revalidate])
 
         def cache_control_segments
           if cache_control = _cache_control
diff --git a/actionpack/lib/action_dispatch/http/response.rb b/actionpack/lib/action_dispatch/http/response.rb
index 9b11111a67..b426d272f2 100644
--- a/actionpack/lib/action_dispatch/http/response.rb
+++ b/actionpack/lib/action_dispatch/http/response.rb
@@ -412,6 +412,13 @@ module ActionDispatch # :nodoc:
     end
 
     def before_sending
+      # Normally we've already committed by now, but it's possible
+      # (e.g., if the controller action tries to read back its own
+      # response) to get here before that. In that case, we must force
+      # an "early" commit: we're about to freeze the headers, so this is
+      # our last chance.
+      commit! unless committed?
+
       headers.freeze
       request.commit_cookie_jar! unless committed?
     end