diff --git a/example/fly.toml b/example/fly.toml
index 9b270f4..b6736b0 100644
--- a/example/fly.toml
+++ b/example/fly.toml
@@ -23,3 +23,5 @@ processes = []
     type = "requests"
     soft_limit = 200
     hard_limit = 250
+  [http_service.http_options.response.headers]
+    Content-Security-Policy = 'upgrade-insecure-requests'