Receiving error:

[debug] mod_headers.c(663): headers: ap_headers_output_filter()

after I included this within the .htaccess file:

# 6 DAYS
<FilesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf)$">
Header set Cache-Control "max-age=518400, public"
# 2 DAYS
<FilesMatch "\.(xml|txt)$">
Header set Cache-Control "max-age=172800, public, must-revalidate"
<FilesMatch "\.(html|htm)$">
Header set Cache-Control "max-age=7200, must-revalidate"

Any help is appreciated as to what I could do to fix this?

1 Answer 1


Generally since this is a debug level error/notice, you can turn it off in Apache config (perhaps /etc/apache2/sites-enabled/somesite, /etc/apache2/httpd.conf or /etc/apache2/apache2.conf or perhaps a .htaccess file) by setting a line to:

LogLevel warn

as opposed to:

LogLevel debug
  • "or perhaps a .htaccess file" - You can't actually set this in .htaccess, it needs to be in the main server config or virtualhost.
    – MrWhite
    Sep 2, 2020 at 11:42

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