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Be reachable

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You have Use
A public IP direct
A tailnet tailscale, with Funnel for the public side
A VPS you already run frp, or the built-in ingress role on your own domain
Neither, but an account ngrok, cloudflare
No inbound path at all a tunnel from the rows above, or let a provider host the identity under a leaf you issue (HDTP §9)

Then check your work:

hdtp-gateway doctor

It derives your deployment mode, probes your endpoint, and reports what an outside caller would actually see.