This question explores Website Security and addresses practical considerations related to: What’s the best approach to enforce HSTS preload for all subdomains?

To enforce HSTS preload for all subdomains, you should include the `preload` directive in your HSTS header and ensure your domain is submitted to the HSTS preload list. This helps browsers automatically enforce HTTPS for your domain and its subdomains. Strict-Transport-Security: max-age=31536000; includeSubDomains; preload Additional Comment: Ensure your entire site and all subdomains are served over HTTPS before enabling HSTS with `preload`. Once preloaded, your domain will be hardcoded into browsers to enforce HTTPS, which cannot be easily reversed. Regularly check your site's eligibility for the preload list at hstspreload.org. ✅

What’s the best approach to enforce HSTS preload for all subdomains?

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What’s the best approach to enforce HSTS preload for all subdomains?

Asked on Sep 16, 2025

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To enforce HSTS preload for all subdomains, you should include the `preload` directive in your HSTS header and ensure your domain is submitted to the HSTS preload list. This helps browsers automatically enforce HTTPS for your domain and its subdomains.

<!-- BEGIN COPY / PASTE -->
    Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
    <!-- END COPY / PASTE -->

Additional Comment:

Ensure your entire site and all subdomains are served over HTTPS before enabling HSTS with `preload`.
Once preloaded, your domain will be hardcoded into browsers to enforce HTTPS, which cannot be easily reversed.
Regularly check your site's eligibility for the preload list at hstspreload.org.

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Ask any question about Website Security here... and get an instant response.

What’s the best approach to enforce HSTS preload for all subdomains?

Asked on Sep 16, 2025

Answer

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