How to allow google bot,when i open "i'm under attack" mode?

Zero Trust Access
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1

as this title.
i want open “i’m under attack” mode and allow google bot.
can set whitelist?
how to?

2

The only way I can think of is to use a Firewall Rule that checks if the User Agent is NOT the Googlebot string, then Javascript Challenge the visitor.

The problem would be if an attacker is spoofing a Googlebot User Agent string.

3

first:User Agent can forged,
so The best way is Tracking IP source.

4

There’s no list of IP addresses Googlebots use, so you won’t be able to whitelist by IP address.

5

yes,no list.
but can use nslookup cli query Isn’t it google bot.