Limit Server Options Requests

in httpd.conf

<IfModule hmod_allowmethods>
   AllowMethods GET POST OPTIONS
</IfModule>

In each VirtualHost directive

## Disallow OPTIONS METHOD
RewriteEngine On
RewriteCond %{REQUEST_METHOD} !(GET|POST)
RewriteRule .* - [F]

This seems to stop the majority of the requests

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