diff --git a/actionpack/lib/action_dispatch/http/response.rb b/actionpack/lib/action_dispatch/http/response.rb
index 378fd5e61d..6e63fc0067 100644
--- a/actionpack/lib/action_dispatch/http/response.rb
+++ b/actionpack/lib/action_dispatch/http/response.rb
@@ -145,18 +145,6 @@ module ActionDispatch # :nodoc:
 
     cattr_accessor(:default_charset) { "utf-8" }
 
-    def assign_default_content_type_and_charset!
-      return if headers[CONTENT_TYPE].present?
-
-      @content_type ||= Mime::HTML
-      @charset      ||= self.class.default_charset
-
-      type = @content_type.to_s.dup
-      type << "; charset=#{@charset}" unless @sending_file
-
-      headers[CONTENT_TYPE] = type
-    end
-
     def to_a
       assign_default_content_type_and_charset!
       handle_conditional_get!
@@ -259,6 +247,18 @@ module ActionDispatch # :nodoc:
         !@blank && @body.respond_to?(:all?) && @body.all? { |part| part.is_a?(String) }
       end
 
+      def assign_default_content_type_and_charset!
+        return if headers[CONTENT_TYPE].present?
+
+        @content_type ||= Mime::HTML
+        @charset      ||= self.class.default_charset
+
+        type = @content_type.to_s.dup
+        type << "; charset=#{@charset}" unless @sending_file
+
+        headers[CONTENT_TYPE] = type
+      end
+
       DEFAULT_CACHE_CONTROL = "max-age=0, private, must-revalidate"
 
       def set_conditional_cache_control!
@@ -280,7 +280,6 @@ module ActionDispatch # :nodoc:
 
           headers["Cache-Control"] = options.join(", ")
         end
-
       end
   end
 end
diff --git a/actionpack/test/dispatch/response_test.rb b/actionpack/test/dispatch/response_test.rb
index a0250088a5..59ad2e48bd 100644
--- a/actionpack/test/dispatch/response_test.rb
+++ b/actionpack/test/dispatch/response_test.rb
@@ -117,4 +117,117 @@ class ResponseTest < ActiveSupport::TestCase
     assert_equal "user_name=david; path=/\nlogin=foo%26bar; path=/; expires=Mon, 10-Oct-2005 05:00:00 GMT", headers["Set-Cookie"]
     assert_equal({"login" => "foo&bar", "user_name" => "david"}, @response.cookies)
   end
+
+  test "read cache control" do
+    resp = ActionDispatch::Response.new.tap { |resp|
+      resp.cache_control[:public] = true
+      resp.etag = '123'
+      resp.body = 'Hello'
+    }
+    resp.to_a
+
+    assert_equal('"202cb962ac59075b964b07152d234b70"', resp.etag)
+    assert_equal({:public => true}, resp.cache_control)
+
+    assert_equal('public', resp.headers['Cache-Control'])
+    assert_equal('"202cb962ac59075b964b07152d234b70"', resp.headers['ETag'])
+  end
+
+  test "read charset and content type" do
+    resp = ActionDispatch::Response.new.tap { |resp|
+      resp.charset = 'utf-16'
+      resp.content_type = Mime::XML
+      resp.body = 'Hello'
+    }
+    resp.to_a
+
+    assert_equal('utf-16', resp.charset)
+    assert_equal(Mime::XML, resp.content_type)
+
+    assert_equal('application/xml; charset=utf-16', resp.headers['Content-Type'])
+  end
+end
+
+class ResponseIntegrationTest < ActionDispatch::IntegrationTest
+  def app
+    @app
+  end
+
+  test "response cache control from railsish app" do
+    @app = lambda { |env|
+      ActionDispatch::Response.new.tap { |resp|
+        resp.cache_control[:public] = true
+        resp.etag = '123'
+        resp.body = 'Hello'
+      }.to_a
+    }
+
+    get '/'
+    assert_response :success
+
+    assert_equal('public', @response.headers['Cache-Control'])
+    assert_equal('"202cb962ac59075b964b07152d234b70"', @response.headers['ETag'])
+
+    pending do
+      assert_equal('"202cb962ac59075b964b07152d234b70"', @response.etag)
+      assert_equal({:public => true}, @response.cache_control)
+    end
+  end
+
+  test "response cache control from rackish app" do
+    @app = lambda { |env|
+      [200,
+        {'ETag' => '"202cb962ac59075b964b07152d234b70"',
+          'Cache-Control' => 'public'}, 'Hello']
+    }
+
+    get '/'
+    assert_response :success
+
+    assert_equal('public', @response.headers['Cache-Control'])
+    assert_equal('"202cb962ac59075b964b07152d234b70"', @response.headers['ETag'])
+
+    pending do
+      assert_equal('"202cb962ac59075b964b07152d234b70"', @response.etag)
+      assert_equal({:public => true}, @response.cache_control)
+    end
+  end
+
+  test "response charset and content type from railsish app" do
+    @app = lambda { |env|
+      ActionDispatch::Response.new.tap { |resp|
+        resp.charset = 'utf-16'
+        resp.content_type = Mime::XML
+        resp.body = 'Hello'
+      }.to_a
+    }
+
+    get '/'
+    assert_response :success
+
+    pending do
+      assert_equal('utf-16', @response.charset)
+      assert_equal(Mime::XML, @response.content_type)
+    end
+
+    assert_equal('application/xml; charset=utf-16', @response.headers['Content-Type'])
+  end
+
+  test "response charset and content type from rackish app" do
+    @app = lambda { |env|
+      [200,
+        {'Content-Type' => 'application/xml; charset=utf-16'},
+        'Hello']
+    }
+
+    get '/'
+    assert_response :success
+
+    pending do
+      assert_equal('utf-16', @response.charset)
+      assert_equal(Mime::XML, @response.content_type)
+    end
+
+    assert_equal('application/xml; charset=utf-16', @response.headers['Content-Type'])
+  end
 end