Hi,

If you are getting the following error in your apache logs then you should probably load “mod_headers.so” to your apache server.

Invalid command 'Header', perhaps misspelled or defined by a module not included in the server configuration

Fix

==

If you are using Centos server then you need to edit your apache configuration file and add the following line

LoadModule headers_module modules/mod_headers.so 

/etc/init.d/httpd restart 

Reference: http://littletechthoughts.blogspot.com/2009/02/invalid-command-header-perhaps.html

 
If you are using Ubuntu based Operating system then you need to do the following and restart your apache service.

cp -arp /etc/apache2/mods-available/headers.load  /etc/apache2/mods-enabled/headers.load  

/etc/init.d/apache2 restart

Thank you for viewing helpinlinux.com