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

I added in htaccess works perfectly for me.

RewriteEngine On
RewriteCond %{HTTPS} off
# First rewrite to HTTPS:
# Don't put www. here. If it is already there it will be included, if not
# the subsequent rule will catch it.
RewriteRule .* https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
# Now, rewrite any request to the wrong domain to use www.
# [NC] is a case-insensitive match
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule .* https://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]


# Use HTTP Strict Transport Security to force client to use secure connections only
Header always set Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" "expr=%{HTTPS} == 'on'"

env=HTTPS not works now.