[Zope] grokking _vh_ in VirtualHostMonster

[Evan Simpson]

From: "seb bacon" <seb@jamkit.com>
>   RewriteRule ^/([^/]+)/?(.*)
http://localhost:9080/VirtualHostBase/http/www.foo.com:80/demo/$1/SomeFo
lder/VirtualHostRoot/$1/$2 [P]
>
>   RewriteRule ^/([^/]+)/?(.*)
http://localhost:9080/VirtualHostBase/http/www.foo.com:80/demo/$1/SomeFo
lder/VirtualHostRoot/_vh_$1/$2 [P]
>
> Why did the second version (with _vh_) work, but the first not?

Because 'VirtualHostRoot' removes all of the path up to that point from
the URL, and does this by remembering the absolute_url() of the object
found at that step.  In your first version, putting '$1' in the path a
second time complicated acquisition a little, but does nothing for your
URL.  I added the '_vh_' behavior to support people who map a domain
subdirectory into a Zope's root.  Yours is an intermediate case, mapping
a domain subdirectory into a Zope subfolder.  Path segments like
'_vh_XXX', right after the 'VirtualHostRoot', add to the URL path
without trying to find a Zope object named 'XXX'.

Cheers,

Evan @ 4-am & Zope