377
}
378
380
>
// Pick a frontend host at random.
381
>
members := rt.resolver.AvailableMembers()
382
>
if len(members) == 0 {
383
return nil, serviceerror.NewUnavailable("no frontend host to route request to")
384
}
386
>
member := members[idx]
387
>
388
>
// Replace port with the HTTP port.
389
>
host, _, err := net.SplitHostPort(member.Identity())
390
>
if err != nil {
391
return nil, fmt.Errorf("failed to extract port from frontend member: %w", err)
392
}
394
>
395
>
// Replace request's host.
396
>
req.URL.Host = address
397
>
req.Host = address
398
>
return rt.underlying.RoundTrip(req)
399
}
400