diff --git a/framework/warmup.py b/framework/warmup.py
index ace76ce..a133107 100644
--- a/framework/warmup.py
+++ b/framework/warmup.py
@@ -10,55 +10,26 @@
 
 import logging
 
-from framework import jsonfeed
 
-
-# TODO(https://crbug.com/monorail/6511): Convert to FlaskInternalTask
-class Warmup(jsonfeed.InternalTask):
+def Warmup():
   """Placeholder for warmup work.  Used only to enable min_idle_instances."""
-
-  def HandleRequest(self, _mr):
-    """Don't do anything that could cause a jam when many instances start."""
-    logging.info('/_ah/startup does nothing in Monorail.')
-    logging.info('However it is needed for min_idle_instances in app.yaml.')
-
-    return {
-      'success': 1,
-      }
-
-  # def GetWarmup(self, **kwargs):
-  #   return self.handler(**kwargs)
+  # Don't do anything that could cause a jam when many instances start.
+  logging.info('/_ah/startup does nothing in Monorail.')
+  logging.info('However it is needed for min_idle_instances in app.yaml.')
+  return ''
 
 
-# TODO(https://crbug.com/monorail/6511): Convert to FlaskInternalTask
-class Start(jsonfeed.InternalTask):
+def Start():
   """Placeholder for start work.  Used only to enable manual_scaling."""
-
-  def HandleRequest(self, _mr):
-    """Don't do anything that could cause a jam when many instances start."""
-    logging.info('/_ah/start does nothing in Monorail.')
-    logging.info('However it is needed for manual_scaling in app.yaml.')
-
-    return {
-      'success': 1,
-      }
-
-  # def GetStart(self, **kwargs):
-  #   return self.handler(**kwargs)
+  # Don't do anything that could cause a jam when many instances start.
+  logging.info('/_ah/start does nothing in Monorail.')
+  logging.info('However it is needed for manual_scaling in app.yaml.')
+  return ''
 
 
-# TODO(https://crbug.com/monorail/6511): Convert to FlaskInternalTask
-class Stop(jsonfeed.InternalTask):
+def Stop():
   """Placeholder for stop work.  Used only to enable manual_scaling."""
-
-  def HandleRequest(self, _mr):
-    """Don't do anything that could cause a jam when many instances start."""
-    logging.info('/_ah/stop does nothing in Monorail.')
-    logging.info('However it is needed for manual_scaling in app.yaml.')
-
-    return {
-      'success': 1,
-      }
-
-  # def GetStop(self, **kwargs):
-  #   return self.handler(**kwargs)
+  # Don't do anything that could cause a jam when many instances start."""
+  logging.info('/_ah/stop does nothing in Monorail.')
+  logging.info('However it is needed for manual_scaling in app.yaml.')
+  return ''