OWASPASVS 5.0 requirement

ASVS-V3.7.4 The application's top-level domain (e.g., site.tld) is added to the public preload list for http strict transport security (hsts).

L3 Published 2025 Official page ↗
Standard
OWASP ASVS 5.0
Chapter
V3 Web Frontend Security
Section
V3.7 Other Browser Security Considerations
Level
L3 (requirement applies from this verification level up)

Requirement

Verify that the application's top-level domain (e.g., site.tld) is added to the public preload list for HTTP Strict Transport Security (HSTS). This ensures that the use of TLS for the application is built directly into the main browsers, rather than relying only on the Strict-Transport-Security response header field.