Merge pull request #15799 from cakephp/4.3-http-client-user-agent

Use User-Agent set in php.ini if available.

src/Http/Client/Request.php

@@ -45,7 +45,7 @@ class Request extends Message implements RequestInterface
         $this->uri = $this->createUri($url);
         $headers += [
             'Connection' => 'close',
-            'User-Agent' => 'CakePHP',
+            'User-Agent' => ini_get('user_agent') ?: 'CakePHP',
         ];
         $this->addHeaders($headers);