Some sites on October CMS successfully give header Last-Modified. In the basic functionality it is not, plugins have not found. Please share the experience!

You could implement this using Middleware if you wish.

Middleware doc:
https://laravel.com/docs/8.x/middleware

Attaching Headers to Responses:
https://octobercms.com/docs/services/response-view#attaching-headers-to-responses

mjauvin said:

You could implement this using Middleware if you wish.

Middleware doc:
https://laravel.com/docs/8.x/middleware

Attaching Headers to Responses:
https://octobercms.com/docs/services/response-view#attaching-headers-to-responses

Thank you! I'll try!