Apple TV (and any suspended process) wakes with dead keep-alive sockets in
the HTTP pool. The first request after resume — the health probe — failed
with a connection error, and the failover cascade treated that as a dead
endpoint: it validated the remote candidate, switched to it, and persisted
it as preferred. Nothing walked the session back to the local endpoint,
because the only re-optimization trigger is a connectivity event and a
same-interface sleep/wake never produces one. Only killing the app fixed it.
FailoverHttpClient now runs the existing candidate trust gate against the
current endpoint on a connection error and retries in place when it answers;
timeouts and 5xx still cascade directly. MultiServerManager gains
reoptimizeDemotedServers, called from the resume probe, which re-races any
online Plex server sitting on a remote or relay endpoint while a local one
is published.
close#2056
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