How to disable HSTS header with HTTP?

Question

I have inserted the following in the .htaccess of my site in order to be admitted to the HSTS preload list:

<ifModule mod_headers.c>
Header always set Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"   
</ifModule>

The problem is that when I submit my site, I obtain:

Warning: Unnecessary HSTS header over HTTP. The HTTP page at http: //fabriziorocca.it sends an HSTS header. This has no effect over HTTP, and should be removed.

At the moment I use the following in the .htaccess in order to switch from http to https:

RewriteCond %{HTTPS} off
RewriteRule .* https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule .* https://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

How can I solve the problem?

Thank you in advance.

Answer 1

Below your redirect rules add the code:

Header always set Strict-Transport-Security "max-age=31536000; 
includeSubDomains; preload" env=HTTPS

Answer 2

Try with:

<ifModule mod_headers.c>
Header always set Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" "expr=%{HTTPS} == on"
</ifModule>

RewriteCond %{HTTP_HOST} !^www\.
RewriteRule .* https://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
RewriteCond %{HTTPS} off
RewriteRule .* https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Answer 3

No... Error: HTTP redirects to www first http://domain.fr (HTTP) should immediately redirect to https://domain.fr (HTTPS) before adding the www subdomain. Right now, the first redirect is to https://www.domain.fr/. The extra redirect is required to ensure that any browser which supports HSTS will record the HSTS entry for the top level domain, not just the subdomain.