Access to proxy@8080 or 8082

The way I use wwwoffle is to have two images running at the same time;  one configured to be permanently off-line(8082), the other(8080) permanently on-line, but taken off & on periodicly to keep the indexes from getting too large.

What I am wondering is if there is a way (say on the browser bar) to address one or the other to fetch a url explicitly;  i.e.
    http://localhost:8082/get?http://news.bbc.co.uk/
    to get the cached version


or 
    http://localhost:8080/get?http://news.bbc.co.uk/
    to get an on-line version.

Pardon if this is a naive question:
   How does htdig do it?
   Does wwwoffle have to be offline when htdig is running?