Unset argument after evaluation

web/typo3conf/ext/ep_theme/Classes/ViewHelpers/Uri/AjaxViewHelper.php

@@ -58,17 +58,24 @@ class AjaxViewHelper extends ActionViewHelper
         RenderingContextInterface $renderingContext
     )
     {
+        // Determine page type from format argument
         if (strtolower(trim($arguments['format'])) === 'json') {
             $arguments['pageType'] = self::PAGE_TYPE_JSON;
         } else {
             $arguments['pageType'] = self::PAGE_TYPE_HTML;
         }
+
+        // Unset argument to keep it out of resulting url
+        $arguments['format'] = '';
+
+        // Use current page uid as target unless provided
         if ($arguments['pageUid'] === null) {
             $rootLine = $GLOBALS['TSFE']->sys_page->getRootLine($GLOBALS['TSFE']->id);
             $rootPage = array_pop($rootLine);
             $arguments['pageUid'] = $rootPage['uid'];
         }
 
+        // Force absolute urls
         $arguments['absolute'] = true;
 
         return parent::renderStatic($arguments, $renderChildrenClosure, $renderingContext);