[Httpd Wiki] Update of "RewriteLog" by jmcg

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The "RewriteLog" page has been changed by jmcg:
http://wiki.apache.org/httpd/RewriteLog

New page:
This here describes a recipie for creating a RewriteLog that is actually readable. It is based on Rich
Bowen's presentation
[[http://people.apache.org/~rbowen/presentations/Apache_Nuts_Bolts_files/|Apache Nuts and Bolts]]

Config:
{{{
RewriteLogLevel 9
RewriteLog "||/usr/local/rewrite_log_pipe"
}}}
Like in a usual setup, we set `RewriteLogLevel` high enough to be verbose enough. However, instead of
logging to a file, we will pipe the log through a program.

This program will be a short and simple Perl script:

{{{#!perl
#!/usr/bin/env perl

$|++
open (F, ">>/tmp/rewrite.log");
select F;

while (<>) {