576 ## Plugin  section in Guzzle Upgrade Guide
578 The `Guzzle\Plugin` namespace has been renamed to `GuzzleHttp\Subscriber`.
594 - `GuzzleHttp\Plugin\Async` has been removed.
595 - `GuzzleHttp\Plugin\CurlAuth` has been removed.
596 - `GuzzleHttp\Plugin\ErrorResponse\ErrorResponsePlugin` has been removed. This
603 - `Guzzle\Http\Plugin\BackoffPlugin` has been rewritten to be much simpler
606 - `Guzzle\Http\Plugin\Cache\CachePlugin` has moved to
608 - `Guzzle\Http\Plugin\Log\LogPlugin` has moved to
610 - `Guzzle\Http\Plugin\Md5\Md5Plugin` has moved to
612 - `Guzzle\Http\Plugin\Mock\MockPlugin` has moved to
614 - `Guzzle\Http\Plugin\Oauth\OauthPlugin` has moved to
684 - Marked `Guzzle\Http\Message\Request::canCache()` as deprecated. Use `Guzzle\Plugin\Cache\DefaultC…
685 - Marked `Guzzle\Http\Message\Request::canCache()` as deprecated. Use `Guzzle\Plugin\Cache\DefaultC…
692 - Marked `Guzzle\Plugin\CurlAuth\CurlAuthPlugin` as deprecated. Use
1126 ### Guzzle\Http\Plugin
1128 Namespace is now `Guzzle\Plugin`. Many other changes occur within this namespace and are detailed i…
1130 ### Guzzle\Http\Plugin\LogPlugin and Guzzle\Common\Log
1132 Now `Guzzle\Plugin\Log\LogPlugin` and `Guzzle\Log` respectively.
1138 use Guzzle\Http\Plugin\LogPlugin;
1152 use Guzzle\Plugin\Log\LogPlugin;
1161 ### Guzzle\Http\Plugin\CurlAuthPlugin
1163 Now `Guzzle\Plugin\CurlAuth\CurlAuthPlugin`.
1165 ### Guzzle\Http\Plugin\ExponentialBackoffPlugin
1167 Now `Guzzle\Plugin\Backoff\BackoffPlugin`, and other changes.
1172 use Guzzle\Http\Plugin\ExponentialBackoffPlugin;
1184 use Guzzle\Plugin\Backoff\BackoffPlugin;
1185 use Guzzle\Plugin\Backoff\HttpBackoffStrategy;