How to call servlets from a front end server?

I've set up a front end http server (in VisualWorks 7.3.1 on Windows) which talks to the VisualWorks external http server through a cgi gateway.

At any rate, I can call my ssp pages by typing:

http://website/cgi/cgi-gateway.exe/whatever.ssp.

However, I am at a loss as to how to structure a request for my servlets, which were working before I set up two servers.  The following doesn't work:

http://website/cgi/cgi-gateway.exe/servlet/MyServlet.

Anyone know how to access these servlets running on the back end?

Thanks.