Fix k8s chaining (#510)

* fix k8s next middleware chaining

* add chain to integration tests

* if nit

1 files changed, 10 insertions, 9 deletions

diff --git a/middleware/kubernetes/handler.go b/middleware/kubernetes/handler.go
index 3efe6e722..326e3ac13 100644
--- a/middleware/kubernetes/handler.go
+++ b/middleware/kubernetes/handler.go
@@ -26,16 +26,17 @@ func (k Kubernetes) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.M
 	// otherwise delegate to the next in the pipeline.
 	zone := middleware.Zones(k.Zones).Matches(state.Name())
 	if zone == "" {
-		if state.Type() == "PTR" {
-			// If this is a PTR request, and a the request is in a defined
-			// pod/service cidr range, process the request in this middleware,
-			// otherwise pass to next middleware.
-			if !k.IsRequestInReverseRange(state) {
-				return middleware.NextOrFailure(k.Name(), k.Next, ctx, w, r)
-			}
-			// Set the zone to this specific request.
-			zone = state.Name()
+		if state.Type() != "PTR" {
+			return middleware.NextOrFailure(k.Name(), k.Next, ctx, w, r)
 		}
+		// If this is a PTR request, and the request is in a defined
+		// pod/service cidr range, process the request in this middleware,
+		// otherwise pass to next middleware.
+		if !k.IsRequestInReverseRange(state) {
+			return middleware.NextOrFailure(k.Name(), k.Next, ctx, w, r)
+		}
+		// Set the zone to this specific request.
+		zone = state.Name()
 	}
 
 	var (