next tracking PR for version 4.1.0#318
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While working with this with users, this feature can't really exist as is with worker to worker calls. If you have an isolated session calls a worker on Cloudflare, that internally have to call another worker with the session information, that fails, since the Linkup worker is unaware of this session, so it doesn't really know where to go. This would also break if the isolated session have local service that is called by a remote worker, since it cannot reach local (no tunnel). So instead of trying to patch around for this to work, we have decided to remove the feature and do a new stab at it by looking into supporting multiple tunneled sessions on the same tunnel. But that will be done separately.
Druue
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May 27, 2026
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Isolated Sessions removal info
While working with this with users, this feature can't really exist as is with worker to worker calls.
If you have an isolated session calls a worker on Cloudflare, that internally have to call another worker
with the session information, that fails, since the Linkup worker is unaware of this session, so it doesn't
really know where to go.
This would also break if the isolated session have local service that is called by a remote worker,
since it cannot reach local (no tunnel).
So instead of trying to patch around for this to work, we have decided to remove the feature and
do a new stab at it by looking into supporting multiple tunneled sessions on the same tunnel.
But that will be done separately and released as another minor.