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replace host options with endpoint client option - #462
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maratal
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October 12, 2026 03:30
Version 2 adopts the endpoint routing model from the spec (REC1/REC2),
so clients connect to *.realtime.ably.net, with fallbacks on
*.fallback.ably-realtime.com, instead of the rest/realtime.ably.io
domains.
- Add the :endpoint option (default 'main'). It accepts a routing
policy name ('acme'), a non-production policy ('nonprod:sandbox') or
a hostname. REST and realtime now share one primary domain
- Remove :environment, :rest_host, :realtime_host, :ws_host and
:fallback_hosts_use_default
- Derive default fallback hosts from the endpoint: none for a
hostname, and explicit :fallback_hosts still override them. A custom
port no longer disables fallbacks
- client.endpoint now returns the option value, the connection URI
moves to client.uri, and client.primary_domain replaces
environment/custom_host and the DOMAIN constants
- Move endpoint resolution into Ably::Internal
- Connect the WebSocket using the unbracketed hostname so IPv6 literal
endpoints work
- Point specs at ABLY_ENDPOINT (default nonprod:sandbox) and cover the
endpoint and fallback resolution cases
- Document the migration in UPDATING.md
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Version 2 adopts the endpoint routing model from the spec (REC1/REC2),
so clients connect to *.realtime.ably.net, with fallbacks on
*.fallback.ably-realtime.com, instead of the rest/realtime.ably.io
domains.
policy name ('acme'), a non-production policy ('nonprod:sandbox') or
a hostname. REST and realtime now share one primary domain
:fallback_hosts_use_default
hostname, and explicit :fallback_hosts still override them. A custom
port no longer disables fallbacks
moves to client.uri, and client.primary_domain replaces
environment/custom_host and the DOMAIN constants
endpoints work
endpoint and fallback resolution cases