provide a request and response to all controllers

Controllers should always have a request and response when responding.
Since we make this The Rule(tm), then controllers don't need to be
somewhere in limbo between "asking a response object for a rack
response" or "I, myself contain a rack response".  This duality leads to
conditionals spread through the codebase that we can delete:

  * https://github.com/rails/rails/blob/85a78d9358aa728298cd020cdc842b55c16f9549/actionpack/lib/action_controller/metal.rb#L221-L223

1 files changed, 2 insertions, 3 deletions

diff --git a/actionpack/lib/action_controller/metal/head.rb b/actionpack/lib/action_controller/metal/head.rb
index 056962b38c..7dbd5ef328 100644
--- a/actionpack/lib/action_controller/metal/head.rb
+++ b/actionpack/lib/action_controller/metal/head.rb
@@ -36,6 +36,8 @@ module ActionController
         headers[key.to_s.dasherize.split('-').each { |v| v[0] = v[0].chr.upcase }.join('-')] = value.to_s
       end
 
+      response.status = Rack::Utils.status_code(status)
+
       self.status = status
       self.location = url_for(location) if location
 
@@ -44,9 +46,6 @@ module ActionController
       if include_content?(self.response_code)
         self.content_type = content_type || (Mime[formats.first] if formats)
         self.response.charset = false if self.response
-      else
-        headers.delete('Content-Type')
-        headers.delete('Content-Length')
       end
 
       true