Apache: Disable the ETag Header by
FileETag None
For Linux systems;
look for one of these files ans add “FileETag None”
/etc/apache2/conf-enabled/security.conf
/etc/apache2/conf.d/local.conf
/etc/apache2/conf.d/security
/etc/apache2/httpd.conf
Windows;
add the following two lines to an .htaccess file in your account’s public_html directory:
Header unset ETag
FileETag None