ability to use external yii2-httpclient object

EasyThumbnail.php

@@ -8,6 +8,7 @@
 namespace himiklab\thumbnail;
 
 use yii\base\BaseObject;
+use yii\httpclient\Client as HttpClient;
 
 /**
  * EasyThumbnailImage global configuration component.
@@ -23,9 +24,17 @@ class EasyThumbnail extends BaseObject
     /** @var integer $cacheExpire seconds */
     public $cacheExpire = 0;
 
+    /** @var HttpClient */
+    public $httpClient;
+
     public function init()
     {
         EasyThumbnailImage::$cacheAlias = $this->cacheAlias;
         EasyThumbnailImage::$cacheExpire = $this->cacheExpire;
+
+        EasyThumbnailImage::$httpClient = $this->httpClient;
+        if (EasyThumbnailImage::$httpClient === null || !(EasyThumbnailImage::$httpClient instanceof HttpClient)) {
+            EasyThumbnailImage::$httpClient = new HttpClient();
+        }
     }
 }

EasyThumbnailImage.php

@@ -13,7 +13,6 @@
 use yii\base\InvalidConfigException;
 use yii\helpers\FileHelper;
 use yii\helpers\Html;
-use yii\httpclient\Client;
 use yii\imagine\Image;
 
 /**
@@ -38,6 +37,9 @@ class EasyThumbnailImage
     /** @var int $cacheExpire */
     public static $cacheExpire = 0;
 
+    /** @var yii\httpclient\Client */
+    public static $httpClient;
+
     /**
      * Creates and caches the image thumbnail and returns ImageInterface.
      *
@@ -247,7 +249,7 @@ protected static function errorHandler($error, $filename)
      */
     protected static function fileFromUrlDate($url)
     {
-        $response = (new Client())
+        $response = self::$httpClient
             ->head($url)
             ->send();
         if (!$response->isOk) {
@@ -264,7 +266,7 @@ protected static function fileFromUrlDate($url)
      */
     protected static function fileFromUrlContent($url)
     {
-        $response = (new Client())
+        $response = self::$httpClient
             ->createRequest()
             ->setMethod('GET')
             ->setUrl($url)