redirect to www

1. GOTO: Rules->redirect rules
2. Incoming requests match: hostname equals example.com
3. Then: Dynamic Expresion = concat("https://www.example.lt", http.request.uri.path)
4. Preserve query string = checked

https://community.cloudflare.com/t/redirect-example-com-to-www-example-com-using-single-dynamic-redirects/636762