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If-Modified-since need enabled on Centos 6 server

I am trying to improve my Amazon VPS server response time based on Google's page speed saying I need to load a page in 200 ms or less.   After completing a webserver test at https://varvy.com  I get this message

This page does not appear to support if modified since.

Tool did not find if modified since indicators.

Guideline states: 'Make sure that your web server correctly supports the If-Modified-Since HTTP header.'

Currently, I have Apache 2.2.15 and I can't find anything in the httpd.conf file.  Please help me to get this server to not have this error.
Apache Web ServerLinux DistributionsAWSLinux

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8/22/2022 - Mon