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This page provides an overview of push queues. Push queues run tasks by dispatching HTTP requests to App Engine worker services. The requests are delivered at a constant rate. If a task fails, the service retries the task, sending another request. You must provide a handler for every kind of task you use. A single service can have multiple handlers for different kinds of tasks, or you can use different services to manage different task types.
This API is supported for first-generation runtimes and can be used when upgrading to corresponding second-generation runtimes. If you are updating to the App Engine runtime, refer to the Upgrade to second-generation runtimes page to learn about your migration options for legacy bundled services. The task deadlineWhen a worker service receives a push task request, it must handle the request and send an HTTP response before a deadline that depends on the scaling type of the worker service.
Automatic scaling services must finish before 10 minutes have elapsed. Manual and basic scaling services can run up to 24 hours.
An HTTP response code between 200–299 indicates success; all other values indicate the task failed. If the task fails to respond within the deadline, or returns an invalid response value, the task is retried.
Retrying a failed taskIf a push task request handler returns an HTTP status code outside the range 200–299, or fails to return any response before the task deadline occurs, the queue retries the task until it succeeds. The system backs off gradually to avoid flooding your application with too many requests, but schedules retry attempts for failed tasks to recur at a minimum of once per hour.
Working with push queuesWhen working with push queues, at a minimum, you'll need to do the following things:
Optionally, you can also:
When you use push queues, your application is subject to additional quotas.
What's nextExcept as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-07 UTC.
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