[Bug 62667] RewriteMap not working with %{HTTP_HOST}

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=62667

--- Comment #5 from Rainer Jung <ra...@kippdata.de> ---
httpd mod_rewrite code seems to be recursive, but it contains the following a
little cryptic comment:

To make rewrite maps useful, the lookup key and
default values must be expanded, so we make
recursive calls to do the work. For security
reasons we must never expand a string that includes
verbatim data from the network. The recursion here
isn't a problem because the result of expansion is
only passed to lookup_map() so it cannot be
re-expanded, only re-looked-up. Another way of
looking at it is that the recursion is entirely
driven by the syntax of the nested curly brackets.

Regards,

Rainer

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