diff --git a/src/AsyncClient.php b/src/AsyncClient.php
index bad6732..fc6ad4d 100644
--- a/src/AsyncClient.php
+++ b/src/AsyncClient.php
@@ -83,13 +83,17 @@ class AsyncClient extends ClientAbstracts
             $this->client->enableSSL();
         }
         $this->client->set($this->settings());
+        if (!empty($this->getAgent())) {
+            $this->withAddedHeader('User-Agent', $this->getAgent());
+        } else {
+            $this->withAddedHeader('User-Agent', ' Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36');
+        }
 
         $path = $this->setParams($path, $data);
 
         $content = $this->getData()->getContents();
 
         $this->withAddedHeader('Accept', ' text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9');
-        $this->withAddedHeader('User-Agent', ' Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36');
         $this->withAddedHeader('Accept-Encoding', 'gzip, deflate');
         $this->withAddedHeader('Content-Length', $this->getData()->getSize());