why 404?

elaconfig.yaml

@@ -62,13 +62,13 @@ data:
   autoscale.concurrency-quantum-of-time: "100ms"
 
   # Scale to zero feature flag
-  autoscale.enable-scale-to-zero: "false"
+  autoscale.enable-scale-to-zero: "true"
 
   # Dynamic parameters (take effect when config map is updated):
 
   # Scale to zero threshold is the time a revision must be idle before
   # it is scaled to zero.
-  autoscale.scale-to-zero-threshold: "5m"
+  autoscale.scale-to-zero-threshold: "1m"
 
 
   # LOGGING CONFIGURATION

pkg/activator/activator.go

@@ -101,7 +101,8 @@ func (a *Activator) getRevisionTargetURL(revision *v1alpha1.Revision) (*url.URL,
 		}
 		return nil, err
 	}
-	svc, err = services.Get(controller.GetElaK8SServiceNameForRevision(revision), metav1.GetOptions{})
+	// TODO: in the future, the target service could have more than one ports.
+	// https://github.com/elafros/elafros/issues/837
 	if len(svc.Spec.Ports) != 1 {
 		return nil, fmt.Errorf("need just one port. Found %v ports", len(svc.Spec.Ports))
 	}
@@ -114,7 +115,6 @@ func (a *Activator) getRevisionTargetURL(revision *v1alpha1.Revision) (*url.URL,
 }
 
 func (a *Activator) proxyRequest(revRequest RevisionRequest, serviceURL *url.URL) {
-	glog.Infof("Sending the request to %q", serviceURL)
 	// TODO: We need to wait a bit after the revision is marked ready.
 	// See https://github.com/elafros/elafros/issues/660: Mark a revision ready at the right time.
 	time.Sleep(2 * time.Second)

sample/helloworld/helloworld.go

@@ -25,7 +25,10 @@ import (
 )
 
 func handler(w http.ResponseWriter, r *http.Request) {
-	log.Print("Hello world received a request.")
+	log.Println("Hello world received a request.")
+	log.Printf("request\n%+v", r)
+	log.Printf("request.Host\n%+v", r.Host)
+	log.Printf("request.URL.Host\n%+v", r.URL.Host)
 	target := os.Getenv("TARGET")
 	if target == "" {
 		target = "NOT SPECIFIED"