In the web interface of Special:PagesWithBadges, it will send a parameter 'badge' to find what page is it.
But it does not show it on the Special:ApiSandbox.
And it is useless with a error msg '<error code="internal_api_error_BadMethodCallException" info="[WDfVdgpAIEAAABr-n20AAAAM] Exception Caught: Call to a member function getSerialization() on a non-object (null)"/>',even though I send the parameter in the request of api.php.