I developed an app that now is running on App Engine, everything goes well till there but now i need to add some headers to my responses for security purposes, so i did some search on the net and i found App Engine Documentation on HTTP Headers that says you just have to add the headers you need on your app.yaml file like following:
handlers:
- url: /images
static_dir: static/images
http_headers:
X-Foo-Header: foo
X-Bar-Header: bar value
vary: Accept-Encoding
# ...
I already did it but no new header is added to my responses. I need to add CSP header as well as HSTS header. Someone knows how to achieve this?