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f00f82b392
The fast-probe mode hard-coded net.DialTimeout("tcp", ...), so testing a
WARP/WireGuard or Hysteria outbound always failed with an i/o timeout —
those transports only listen on UDP, never on TCP.
Probe is now transport-aware: extractOutboundEndpoints tags each endpoint
with the network the proxy actually listens on (UDP for wireguard,
hysteria, and any outbound whose streamSettings.network is hysteria, kcp,
or quic; TCP otherwise). probeUDPEndpoint dials UDP, writes a single
sentinel byte so the kernel can surface ICMP errors, and treats a read
timeout as success (WireGuard ignores invalid packets, so silence is the
expected reply from a reachable server). The result's mode field now
reflects what was probed, so the UI badge shows UDP for these outbounds
instead of mislabelling them as TCP.