How-to – Apache set the debug mode LogLevel

To solve some issues (POST and GET troubles), try to set the LogLevel in debug mode.

Open /etc/apache2/apache2.conf file (for Debian installation) and modify the following line:

#
# LogLevel: Control the number of messages logged to the error_log.
# Possible values include: debug, info, notice, warn, error, crit,
# alert, emerg.
#
LogLevel warn

to

#
# LogLevel: Control the number of messages logged to the error_log.
# Possible values include: debug, info, notice, warn, error, crit,
# alert, emerg.
#
LogLevel debug

Restart the service when modified.