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@smallcircles so, for example, consider a client app that shows a map of a region, and puts pins on the map for each activity with a `location` property.

To provide real-time updates, it could check for SSE support by the server. If it exists, the client could use it to get new activities and show them on the map. If the server doesn't support SSE, the client can re-fetch the actor outbox periodically, and use that to find new activities. Or, just skip real-time updates.