Removed undefined variable.

Author: derrabus

NativeHttpClient.php

@@ -201,7 +201,7 @@ public function request(string $method, string $url, array $options = []): Respo
         ];
 
         $proxy = self::getProxy($options['proxy'], $url);
-        $noProxy = $noProxy ?? $_SERVER['no_proxy'] ?? $_SERVER['NO_PROXY'] ?? '';
+        $noProxy = $_SERVER['no_proxy'] ?? $_SERVER['NO_PROXY'] ?? '';
         $noProxy = $noProxy ? preg_split('/[\s,]+/', $noProxy) : [];
 
         $resolveRedirect = self::createRedirectResolver($options, $host, $proxy, $noProxy, $info, $onProgress);