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====================
Backoff retry plugin
====================
The ``Guzzle\Plugin\Backoff\BackoffPlugin`` automatically retries failed HTTP requests using custom backoff strategies:
.. code-block:: php
use Guzzle\Http\Client;
use Guzzle\Plugin\Backoff\BackoffPlugin;
$client = new Client('http://www.test.com/');
// Use a static factory method to get a backoff plugin using the exponential backoff strategy
$backoffPlugin = BackoffPlugin::getExponentialBackoff();
// Add the backoff plugin to the client object
$client->addSubscriber($backoffPlugin);
The BackoffPlugin's constructor accepts a ``Guzzle\Plugin\Backoff\BackoffStrategyInterface`` object that is used to
determine when a retry should be issued and how long to delay between retries. The above code example shows how to
attach a BackoffPlugin to a client that is pre-configured to retry failed 500 and 503 responses using truncated
exponential backoff (emulating the behavior of Guzzle 2's ExponentialBackoffPlugin).