Harry Harpham 7ddbd84171 ipn/ipnlocal: ensure TestServeUnixSocket actually serves a Unix socket
The test sets up an HTTP-over-Unix server and a reverse proxy pointed at
this server, but prior to this change did not round-trip anything to the
backing server. This change ensures that we test code paths which proxy
Unix sockets for serve.

Fixes #19232
Signed-off-by: Harry Harpham <harry@tailscale.com>
2026-04-03 14:15:15 -06:00
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