How to make a firewall rule to block empty host names?

Hi,
How to make a firewall rule to block empty host names visitors?

Refer to this page on the docs
https://developers.cloudflare.com/ruleset-engine/rules-language/fields/#http-request-header-fields

I can not find what I need to enter here:

If there is no host header the requests won’t route to your origin unless you’re an Enterprise customer with a Spectrum host configured direct to origin.

So it’s blocked by default unless there is another specific header you are asking about.

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