How to debug Apache mod_rewrite

One trick is to turn on the rewrite log. To turn it on, try this line in your Apache HTTP Server main configuration or current virtual host file (not in .htaccess):

LogLevel alert rewrite:trace6

Before Apache httpd 2.4 mod_rewrite, such a per-module logging configuration did not exist yet. Instead you could use the following logging settings:

RewriteEngine On
RewriteLog "/var/log/apache2/rewrite.log"
RewriteLogLevel 3

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