Merge beezly/fix/configurable-pipe-timeout with conflict resolution
in pipe.go (PipeOption/WithReadTimeout functional options pattern).
Fix pipe_test.go: update 4 pipeHalf() calls to pass readTimeout arg
matching the new signature.
Pipe: remove context.WithCancel that caused premature ctx.Done()
before the second pipeHalf could return its error. Replace with a
completed counter that drains both errors even on cancellation.
Transport: increase error channel buffer from 1 to 2 to prevent
goroutine leak when both CopyBuffer goroutines complete.
The 30s hardcoded readTimeout in Pipe() caused all CONNECT tunnel
connections to be hard-closed after 30s of inactivity, breaking
WebSocket and long-polling connections through the proxy.
Pipe() now accepts a WithReadTimeout(d) option. When d is 0 (the
default) no read deadline is set, relying on TCP keepalives or context
cancellation to detect dead connections instead.
The HTTP handler exposes this as the idleTimeout metadata key.
Fixes: https://github.com/go-gost/x/issues/91
ginuerzh
Andrew Beresford
21paradox