This optional parameter specifies the complete URL that will
be used to authenticate the user name and password. It is usually set to
the URL of a CGI or ASP program on a web server that you control. HTTPS is
supported. For more information, see
Section 3.68. <AuthBy URL>.
AuthUrl www.mysite.com/validate.cgi
or ....
AuthUrl https://www.mysite.com/validate.cgi