We don't want these internal methods as public methods in our controllers

or they would be listed in `action_methods`

actionpack/lib/action_controller/metal/live.rb

@@ -280,33 +280,35 @@ def process(name)
       raise error if error
     end
 
-    # Spawn a new thread to serve up the controller in. This is to get
-    # around the fact that Rack isn't based around IOs and we need to use
-    # a thread to stream data from the response bodies. Nobody should call
-    # this method except in Rails internals. Seriously!
-    def new_controller_thread # :nodoc:
-      Thread.new {
-        t2 = Thread.current
-        t2.abort_on_exception = true
-        yield
-      }
+    def response_body=(body)
+      super
+      response.close if response
     end
 
-    def log_error(exception)
-      logger = ActionController::Base.logger
-      return unless logger
+    private
 
-      logger.fatal do
-        message = +"\n#{exception.class} (#{exception.message}):\n"
-        message << exception.annoted_source_code.to_s if exception.respond_to?(:annoted_source_code)
-        message << "  " << exception.backtrace.join("\n  ")
-        "#{message}\n\n"
+      # Spawn a new thread to serve up the controller in. This is to get
+      # around the fact that Rack isn't based around IOs and we need to use
+      # a thread to stream data from the response bodies. Nobody should call
+      # this method except in Rails internals. Seriously!
+      def new_controller_thread # :nodoc:
+        Thread.new {
+          t2 = Thread.current
+          t2.abort_on_exception = true
+          yield
+        }
       end
-    end
 
-    def response_body=(body)
-      super
-      response.close if response
-    end
+      def log_error(exception)
+        logger = ActionController::Base.logger
+        return unless logger
+
+        logger.fatal do
+          message = +"\n#{exception.class} (#{exception.message}):\n"
+          message << exception.annoted_source_code.to_s if exception.respond_to?(:annoted_source_code)
+          message << "  " << exception.backtrace.join("\n  ")
+          "#{message}\n\n"
+        end
+      end
   end
 end