1 files changed, 17 insertions, 0 deletions
diff --git a/aws/aws-sdk-php/src/MultiRegionClient.php b/aws/aws-sdk-php/src/MultiRegionClient.php
index fce855b5..632dfcc6 100644
--- a/aws/aws-sdk-php/src/MultiRegionClient.php
+++ b/aws/aws-sdk-php/src/MultiRegionClient.php
@@ -22,6 +22,8 @@ class MultiRegionClient implements AwsClientInterface
     private $handlerList;
     /** @var array */
     private $aliases;
+    /** @var callable */
+    private $customHandler;
 
     public static function getArguments()
     {
@@ -112,6 +114,11 @@ class MultiRegionClient implements AwsClientInterface
             list($region, $args) = $this->getRegionFromArgs($command->toArray());
             $command = $this->getClientFromPool($region)
                 ->getCommand($command->getName(), $args);
+
+            if ($this->isUseCustomHandler()) {
+                $command->getHandlerList()->setHandler($this->customHandler);
+            }
+
             return $this->executeAsync($command);
         });
 
@@ -191,6 +198,16 @@ class MultiRegionClient implements AwsClientInterface
         return $this->getClientFromPool()->getEndpoint();
     }
 
+    public function useCustomHandler(callable $handler)
+    {
+        $this->customHandler = $handler;
+    }
+
+    private function isUseCustomHandler()
+    {
+        return isset($this->customHandler);
+    }
+
     /**
      * @param string $region    Omit this argument or pass in an empty string to
      *                          allow the configured client factory to apply the