htdig.conf and relative paths

[=?x-user-defined?Q?toylet=2Elinux=5B=A4p=AA=B1=B7N=5D?=]

how could I setup a htdig.conf such that whether I access my site from
"https://abc" , "http://localhost" or http://abc:8080, it would always
reply with the right root in the result urls?

The documentation is really not easy to follow. Example htdig.conf in
the doc didn't expect users to use DocumentRoot (apache's httpd.conf) as
start_url. I didn't have luck with google.com. Don't even know what
keywords to use.

I have just got round round the https:// problem by using two .conf
files (for htdig and htsearch) and url_part_aliases. 

Which htdig ${} variable would return the base url when user submits a
search? That could be a starting point for me.

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