Is it possible to restrict the PoPs that are used so as not to cause cross-border communication?

Both Cato Socket and PoP are feasible. The connection destination PoP specification is a function for the purpose of troubleshooting by changing the connection destination PoP.
By specifying the PoP to connect to, if a PoP fails, failover to another PoP will not work, so we do not recommend using it.

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