fix: host extraction without port

cmd/api-router.go

@@ -88,7 +88,10 @@ func registerAPIRouter(router *mux.Router) {
 	for _, domainName := range globalDomainNames {
 		if IsKubernetes() {
 			routers = append(routers, apiRouter.MatcherFunc(func(r *http.Request, match *mux.RouteMatch) bool {
-				host, _, _ := net.SplitHostPort(getHost(r))
+				host, _, err := net.SplitHostPort(getHost(r))
+				if err != nil {
+					host = r.Host
+				}
 				// Make sure to skip matching minio.<domain>` this is
 				// specifically meant for operator/k8s deployment
 				// The reason we need to skip this is for a special