Removing Apache Header
Some third party scanners gives a warning about having the Apache server name to be public. One of the main reasons to hide this is to give hackers a hard time to guess what web servers you are using. Giving out your Apache version and your OS can let hackers quickly search your server for known vulnerabilities.
edit:
/etc/httpd/conf/httpd.conf #Change the following ServerSignature On #to ServerSignature Off