Log unmatched requests

collector.go

@@ -57,6 +57,7 @@ func (c *Collector) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	// Find a handler that can successfully parse the request, and
 	// get a list of Events.
 	var events []Event
+	matched := false
 hloop:
 	for _, h := range c.handlers {
 		var err error
@@ -65,15 +66,22 @@ hloop:
 		case ErrNoMatch:
 			continue
 		case nil:
+			matched = true
 			w.WriteHeader(http.StatusOK)
 			break hloop
 		default:
-			log.Printf("error parsing report: %v", err)
+			log.Printf("error parsing report (%s): %v", ct, err)
 			http.Error(w, err.Error(), http.StatusBadRequest)
 			return
 		}
 	}
 
+	if !matched {
+		log.Printf("no matching handlers for \"%s\"", ct)
+		http.Error(w, "No matching handlers", http.StatusBadRequest)
+		return
+	}
+
 	// Augment the Events with additional information obtained
 	// from the HTTP request, and send them to the forwarder.
 	for _, e := range events {