an unknown filter was not added: DEFLATE

[craigedmonds]

I am seeing this in my apache error log thousands of times.

[Fri Mar 09 21:04:59 2012] [error] an unknown filter was not added: DEFLATE

How do I stop it from logging this entry?

Or is this a serious issue?

[cPanelTristan]

Hello,

This error message would mean that someone is using mod_deflate code in an .htaccess file, but your server doesn't have mod_deflate installed.

If you want to install mod_deflate, simply use WHM > EasyApache (Apache Update) or /scripts/easyapache to add DEFLATE in the Exhaustive Options List for Apache 2 / 2.2.

You can check to confirm it isn't installed using this command in root SSH:

/usr/local/apache/bin/apachectl -M | grep -i deflate

Thanks!

[nixgurus]

When I try to run given command I got following response

root@server [~]# /usr/local/apache/bin/apachectl -M | grep -i deflate
Warning: DocumentRoot [/home/hopeup/public_html/hopeuplift/gallery/school] does not exist
Warning: DocumentRoot [/home/problog/public_html/t5] does not exist
Syntax OK
root@server [~]#

I checked mentioned directories are missing but how I can trace the exact cause of this log entry ?

[error] an unknown filter was not added: DEFLATE

[cPanelTristan]

As I mentioned, if you don't have mod_deflate, you'd get that error. To resolve it, install it:

If you want to install mod_deflate, simply use WHM > EasyApache (Apache Update) or /scripts/easyapache to add DEFLATE in the Exhaustive Options List for Apache 2 / 2.2.

Otherwise, you'd have to do a search of .htaccess files that might have entries for it.