$ a2enable headers
$ vim <your SSL site config path>
<IfModule mod_headers.c>
Header always set Strict-Transport-Security "max-age=31536000; includeSubdomains; preload"
</IfModule>
$ service apache2 restart
$ whois hstspreload.org
Domain Name: HSTSPRELOAD.ORG
Domain ID: D188554067-LROR
WHOIS Server:
Referral URL: http://www.markmonitor.com
Updated Date: 2016-11-15T23:49:33Z
Creation Date: 2016-05-13T22:22:58Z
Registry Expiry Date: 2017-05-13T22:22:58Z
Sponsoring Registrar: MarkMonitor Inc.
Sponsoring Registrar IANA ID: 292
Domain Status: clientDeleteProhibited https://icann.org/epp
Domain Status: clientTransferProhibited https://icann.org/epp
Domain Status: clientUpdateProhibited https://icann.org/epp
Registrant ID: mmr-87489
Registrant Name: DNS Admin
Registrant Organization: Google Inc.
Registrant Street: 1600 Amphitheatre Parkway
Registrant City: Mountain View
Registrant State/Province: CA
Registrant Postal Code: 94043
Registrant Country: US
Registrant Phone: +1.6502530000
Registrant Phone Ext:
Registrant Fax: +1.6502530001
Registrant Fax Ext:
Registrant Email: dns-admin@google.com
Admin ID: mmr-87489
Admin Name: DNS Admin
Admin Organization: Google Inc.
Admin Street: 1600 Amphitheatre Parkway
Admin City: Mountain View
Admin State/Province: CA
Admin Postal Code: 94043
Admin Country: US
Admin Phone: +1.6502530000
Admin Phone Ext:
Admin Fax: +1.6502530001
Admin Fax Ext:
Admin Email: dns-admin@google.com
Tech ID: mmr-87489
Tech Name: DNS Admin
Tech Organization: Google Inc.
Tech Street: 1600 Amphitheatre Parkway
Tech City: Mountain View
Tech State/Province: CA
Tech Postal Code: 94043
Tech Country: US
Tech Phone: +1.6502530000
Tech Phone Ext:
Tech Fax: +1.6502530001
Tech Fax Ext:
Tech Email: dns-admin@google.com
Name Server: NS-CLOUD-E1.GOOGLEDOMAINS.COM
Name Server: NS-CLOUD-E2.GOOGLEDOMAINS.COM
Name Server: NS-CLOUD-E3.GOOGLEDOMAINS.COM
Name Server: NS-CLOUD-E4.GOOGLEDOMAINS.COM
DNSSEC: unsigned
>>> Last update of WHOIS database: 2017-02-05T19:28:14Z <<<