The App Engine Cron Service allows you to configure regularly scheduled tasks that operate at defined times or regular intervals. These tasks are commonly known as cron jobs. These cron jobs are automatically triggered by the App Engine Cron Service. For instance, you might use this to send out a report email on a daily basis, to update some cached data every 10 minutes, or to update some summary information once an hour.
A cron job will invoke a URL, using an HTTP GET request, at a given time of day. A URL invoked by cron is subject to the same limits and quotas as a normal HTTP request, including the request time limit. Cron jobs run only for the default version of your application.
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