Reverse proxy

I believe I am stating things accurately but will admit that this whole area confuses me, and has, for some time.

* With the IWS Wizard I created an IWS application server, say "labs,"
at port 10011.  The Wizard also created an http server at port 10021.
* I have a website folder in the IFS at www/labs/htdocs/ with .html,
.js, .json, and .css files.
* I have a reverse proxy added to the landing page at port 80 of 
"/labs  to http://the.i.ip:10021";
* A browser request to _http://the.i.ip:10011_ returns "Not Found."
* A browser request to _http://the.i.ip/labs_ opens the correct
labs/index.html but has no styling, links don't connect, and
javascript files aren't active.
* A browser request to _http://the.i.ip:10021_ opens the correct
labs/index.html and all files are accessed.

What has to happen to make _http://the.i.ip/labs_ access the  .css, .js files, and the images folder?