HTTP Strict Transport Security: Apache

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To enable HTTP Strict Transport Security for Apache you can edit the vhosts file. This should only apply to HTTPS connections and therefore is added to the VirtualHost 443 section.

<VirtualHost 10.0.0.1:443>
      # Use HTTP Strict Transport Security to force client to use secure connections only
      Header always set Strict-Transport-Security "max-age=31536000; includeSubDomains"
</VirtualHost>
The max-age value is in seconds. Use 31536000 for 12 months or 63072000 for 24 months

Adding includeSubdomains means that subdomains of the main domain should also be accessed using SSL



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