If DNS is advertising a server in that subnet, connect and verify certs.
Use the local server as long as it is reachable, revert to main site if it fails.
Curious now if this could actually work :D
Edit: Clarifying caching/forwarding server: it could simply be an instance of your webapp speaking with the main database via an isolated connection that uses local redis/tarantool/? for responding to floods of requests.
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I do not know this for certain, though here's one way I imagine it could be done where a common WiFi is available:
Curious now if this could actually work :D
Edit: Clarifying caching/forwarding server: it could simply be an instance of your webapp speaking with the main database via an isolated connection that uses local redis/tarantool/? for responding to floods of requests.