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Disable X-Powered-By and Server headers in Apache/PHP
Answer:
Add the following lines to the Apache configuration (httpd.conf)
Header always unset "X-Powered-By"
ServerTokens Prod
ServerSignature Off
Restart Apache to take effect
apachectl -k graceful
Assume the module mod_headers is enabled
How to check the Apache configuration file (httpd.conf)?
Answer:
When you have made changes to the Apache configuration file (httpd.conf), you should always perform a syntax check on the file before restarting the Apache. Especially if it is on a production environment.
Use the following command to perform a config test
apachectl configtest
How to restart Apache without disconnecting user
Answer:
If you have made changes to the apache configuration (httpd.conf), you would need to restart Apache to re-read the new configuration.
However, you don't need to disconnect user immediately, you can tell the Apache's parent process to advise their children to exit after they have finished their current request. So users will not experience a sudden disconnect.
To do so, use the graceful flag
apachectl -k graceful
