RewriteEngine On
RewriteBase /lp/

# Redirect to HTTPS
RewriteCond %{HTTPS} !=on
RewriteRule ^(.*)$ https://%{HTTP_HOST}/amp/%{REQUEST_URI} [L,R=301,NE]

# Redirect non-www to www
RewriteCond %{HTTP_HOST} !^www\.
RewriteCond %{HTTPS}s on(s)|offs()
RewriteRule ^ http%1://www.%{HTTP_HOST}/amp/%{REQUEST_URI} [NE,L,R=301]