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How to trace .htaccess’ RewriteRule

Recently I’ve have had to debug the RewriteRules of my .htaccess (using Apache 2.2.20 version).

For me, the easisest way I’ve found to debug the RewriteRule is to edit /etc/apache2/sites-available/default and add this lines:

RewriteLog "/var/log/apache2/rewrite.log"
 RewriteLogLevel 2

This lines can also be added to apache2.conf.

Now I can adjust RewriteLogLevel from 0 (no log) to 9 (logs almost everything). Don’t forget to read the Apache 2.2 documentation, as this may affect the server’s performance. To disable the rewrite log, adjust RewriteLogLevel to 0 instead of redirecting the RewriteLog to /dev/null, as the log is still created.

In my case, setting the RewriteLogLevel to 2 is enough to debug the rewrite rules, with this command:

tail -f /var/log/apache2/rewrite.log | grep rewrite

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