Server Removes Last-Modified and ETag Headers?

Hello,

I’m setting Last-Modified and ETag Headers, but it seems that the server is removing them? Why are they being removed? Is there any way to ensure the headers are actually sent?

<?php
header( "Cache-Control: max-age=10" );
header( "Last-Modified: " . gmdate( "D, d M Y H:i:s" ) . " GMT" );
header( "ETag: " . time() );
echo "Hello World";

Demo page is here. This is a brand new site and account. I haven’t modified any settings yet.

Most probably related to PHP configuration, so we can do nothing about it

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