SendError

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resp, err := req.Send(ctx, "backend")
if err != nil {
    var se fsthttp.SendError
    if errors.As(err, &se) {
        switch se.Cause() {
        case fsthttp.SendErrorConnectionTimeout:
            log.Println("connection timed out")

        case fsthttp.SendErrorDNSError:
            log.Printf("DNS lookup failed: rcode=%d, info=%d", se.DNSErrorRCode(), se.DNSErrorInfoCode())

        case fsthttp.SendErrorTLSAlertReceived:
            log.Printf("TLS alert: %d (%s)", se.TLSAlertID(), se.TLSAlertDescription())
        }
    }
}