add JoinDefaultPort for servers' configuration

1 files changed, 2 insertions, 4 deletions

diff --git a/spartan/serve.go b/spartan/serve.go
index 61199b1..a477a45 100644
--- a/spartan/serve.go
+++ b/spartan/serve.go
@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"io"
 	"net"
-	"strings"
 
 	sr "tildegit.org/tjp/sliderule"
 	"tildegit.org/tjp/sliderule/internal"
@@ -32,9 +31,8 @@ func NewServer(
 ) (sr.Server, error) {
 	ss := &spartanServer{handler: handler}
 
-	if strings.IndexByte(hostname, ':') < 0 {
-		hostname = net.JoinHostPort(hostname, "300")
-	}
+	hostname = internal.JoinDefaultPort(hostname, "300")
+	address = internal.JoinDefaultPort(address, "300")
 
 	var err error
 	ss.Server, err = internal.NewServer(ctx, hostname, network, address, errLog, ss.handleConn)