I am trying to get cron to retry failed requests after 2 minute in an app 
engine app (Python3 standard environment).

I am using the following in cron.yaml:

cron:
- description: "daily call"
 url: /twilio/start_call/
 timezone: "America/Anchorage"
 schedule: every day 17:00
 retry_parameters:
   min_backoff_seconds: 120.0
   max_backoff_seconds: 360.0
   max_doublings: 3

The behavior I am seeing when the services responds with 503 is a retry a 
precisely one-minute intervals. 

2018-11-26 17:00:00.764 AKST GET 503 178 B 970 ms AppEngine-Google 
(+http://code.google.com/appengine) /twilio/start_call/
2018-11-26 17:01:01.939 AKST GET 503 178 B 704 ms 
AppEngine-Google;(+http://code.google.com/appengine) /twilio/start_call/
2018-11-26 17:02:02.747 AKST GET 503 178 B 850 ms 
AppEngine-Google;(+http://code.google.com/appengine) /twilio/start_call/
2018-11-26 17:03:03.702 AKST GET 503 178 B 666 ms 
AppEngine-Google;(+http://code.google.com/appengine) /twilio/start_call/
2018-11-26 17:04:04.477 AKST GET 200 189 B 65 ms AppEngine-Google; 
(+http://code.google.com/appengine) /twilio/start_call/

I don't see any indication in the docs of a limit on the min-backoff. Am I 
missing something?

Thanks.

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