How to clear basic authentication credentials when loading url in webview android

webview.setWebViewClient(new MyWebBrowser(userName, password));
   
webview.loadUrl(BuildConfig.WEBVIEW_URL);

sending auth using :

@Override
public void onReceivedHttpAuthRequest(WebView view, HttpAuthHandler handler, String host, String realm) {
    handler.proceed(username, password);       
}

but only first time it (onReceivedHttpAuthRequest) is calling tried to clear cache with all flags but still nothing happens. Can any one help me?