wget and the proxy server

I use the command line download utility to do much of my file downloading. How do I configure wget to use the proxy server?

Rich says

Unless you want to spy on how much traffic the proxy has seen today, it's a bad idea to hard-code its address. wpad.dat does some intelligent things like bypassing the proxy for dynamic CGIs we know can't be cached.

but it doesn't seem to me that wget understands the automatic configuration script.

So I've added the following to my ~/.wgetrc file:

http_proxy = 
use_proxy = on
wait = 15

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