require host header

main.go

@@ -19,7 +19,7 @@ func main() {
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		// error handling for common probes
 		if r.Host == "" {
-			http.BadRequest(w, r)
+			http.Error(w, "", http.StatusBadRequest)
 			return
 		}