adjust decider to not retry client errors

Author: dbu

src/Plugin/RetryPlugin.php

@@ -4,6 +4,7 @@
 
 use Http\Client\Common\Plugin;
 use Http\Client\Exception;
+use Http\Client\Exception\HttpException;
 use Http\Promise\Promise;
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
@@ -56,7 +57,8 @@ public function __construct(array $config = [])
         $resolver->setDefaults([
             'retries' => 1,
             'decider' => function (RequestInterface $request, Exception $e) {
-                return true;
+                // do not retry client errors
+                return !($e instanceof HttpException && $e->getCode() < 500);
             },
             'delay' => __CLASS__.'::defaultDelay',
         ]);