Use Graby's http headers configuration for the authentication request

src/SiteConfig/GrabySiteConfigBuilder.php

@@ -85,6 +85,7 @@ class GrabySiteConfigBuilder implements SiteConfigBuilder
             'notLoggedInXpath' => $config->not_logged_in_xpath ?: null,
             'username' => $credentials['username'],
             'password' => $credentials['password'],
+            'httpHeaders' => $config->http_header,
         ];
 
         $config = new SiteConfig($parameters);

src/SiteConfig/LoginFormAuthenticator.php

@@ -30,7 +30,7 @@ class LoginFormAuthenticator
             $siteConfig->getPasswordField() => $siteConfig->getPassword(),
         ] + $this->getExtraFields($siteConfig);
 
-        $this->browser->request('POST', $siteConfig->getLoginUri(), $postFields);
+        $this->browser->request('POST', $siteConfig->getLoginUri(), $postFields, [], $this->getHttpHeaders($siteConfig));
 
         return $this;
     }
@@ -73,6 +73,20 @@ class LoginFormAuthenticator
         return \count($loggedIn) > 0;
     }
 
+    /**
+     * Processes http_header(*) config, prepending HTTP_ string to the header's name.
+     * See : https://github.com/symfony/browser-kit/blob/5.4/AbstractBrowser.php#L349.
+     */
+    protected function getHttpHeaders(SiteConfig $siteConfig): array
+    {
+        $headers = [];
+        foreach ($siteConfig->getHttpHeaders() as $headerName => $headerValue) {
+            $headers["HTTP_$headerName"] = $headerValue;
+        }
+
+        return $headers;
+    }
+
     /**
      * Returns extra fields from the configuration.
      * Evaluates any field value that is an expression language string.

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;
+    }
 }