To alleviate security risks arising from disclosure of information about files and their properties by Apache Web server, disable FileETag directive. For PCI Compliance it is required to disable ETags
Create a file at /etc/httpd/conf.d/no-etags.conf with the following:
Header unset ETag
FileETag None
Then of course restart Apache.
http://httpd.apache.org/docs/2.2/mod/core.html#FileETag