Use Graby's http headers configuration for the authentication request

src/SiteConfig/SiteConfig.php

@@ -70,6 +70,13 @@ class SiteConfig
      */
     protected $password;
 
+    /**
+     * Associative array of HTTP headers to send with the form.
+     *
+     * @var array
+     */
+    protected $httpHeaders = [];
+
     /**
      * SiteConfig constructor. Sets the properties by name given a hash.
      *
@@ -260,4 +267,16 @@ class SiteConfig
 
         return $this;
     }
+
+    public function getHttpHeaders(): array
+    {
+        return $this->httpHeaders;
+    }
+
+    public function setHttpHeaders(array $httpHeaders): self
+    {
+        $this->httpHeaders = $httpHeaders;
+
+        return $this;
+    }
 }