Apache – An unknown filter was not added: DEFLATE

My ‘apache_error.log’ was logging an error ‘An unknown filter was not added: DEFLATE’ for every request. This is how I resolved it.

• Open httpd.conf in C:\xampp\apache\conf went to line 93 and removed the # before the line LoadModule deflate_module modules/mod_deflate.so (using notepad)
• Restart the apache.

Apache

The Apache HTTP Server Project is an effort to develop and maintain an open-source HTTP server for modern operating systems including UNIX and Windows NT. The goal of this project is to provide a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards.

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