Custom variables

Hey folks.

I can’t find any information about setting custom variables in the
config.
It seems to be possible, but is never mentioned in the documentation as
far
as I can tell. For example, here:

http://gist.github.com/228769

There are two places where variables are used and referenced. A series
of
statements like this:

ancient_browser msie 4.0;
ancient_browser msie 5.0;

Apparently compose an array that can be referenced like this:

if ($ancient_browser){ …

Then a statement like this:

set $unsupported_browser_rewrite perform;

Apparently can then be referenced like this:

if ($unsupported_browser_rewrite = perform)

Clearly the first case involves some specialized behavior regarding the
browser used by the request… but the grammar is really obtuse. Can
someone
point me to the documentation that explains all this?

Thanks,
John

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