fix http client cookie

var/Typecho/Http/Client.php

@@ -39,13 +39,6 @@ class Client
      */
     private string $query;
 
-    /**
-     * User Agent
-     *
-     * @var string
-     */
-    private string $agent;
-
     /**
      * 设置超时
      *
@@ -116,6 +109,7 @@ class Client
     public function setCookie(string $key, $value): Client
     {
         $this->cookies[$key] = $value;
+        $this->setHeader('Cookie', str_replace('&', '; ', http_build_query($this->cookies)));
         return $this;
     }
 
@@ -304,10 +298,6 @@ class Client
                 $headers[] = $key . ': ' . $val;
             }
 
-            if (!empty($this->cookies)) {
-                $headers[] = 'Cookie: ' . str_replace('&', '; ', http_build_query($this->cookies));
-            }
-
             curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
         }