Basic Authentication – LogOut via Javascript

I found this procedure on Stackoverflow (http://stackoverflow.com/questions/233507/how-to-log-out-user-from-web-site-using-basic-authentication) that allow clear authentication saved in the browser for your site:

     
     function ClearAuthentication(LogOffPage) 
  {
     var IsInternetExplorer = false;    
     admin = 'n';
     try
     {
         var agt=navigator.userAgent.toLowerCase();
         if (agt.indexOf("msie") != -1) { IsInternetExplorer = true; }
     }
     catch(e)
     {
         IsInternetExplorer = false;    
     };

     if (IsInternetExplorer) 
     {
        // Logoff Internet Explorer
        document.execCommand("ClearAuthenticationCache");
        window.location = LogOffPage;
     }
     else 
     {
        // Logoff every other browsers
    $.ajax({
         username: 'unknown',
         password: 'WrongPassword',
             url: '/',
         type: 'GET',
         beforeSend: function(xhr)
                 {
            xhr.setRequestHeader("Authorization", "Basic AAAAAAAAAAAAAAAAAAA=");
         },

                 error: function(err)
                 {
	                //alert(window.location.protocol + '//xxxx:xxxx@' + window.location.host + ':' + window.location.port + LogOffPage);
                    window.location = window.location.protocol + '//xxxx:xxxx@' + window.location.host + LogOffPage;
				    window.location = window.location.protocol + '//' + window.location.host + LogOffPage;
             }
    });
     }
  }

i tried it on chrome and firefox and function as aspect:

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