HTTP Strict Transport Security (HSTS) RFC 6797
HSTS erzwingt die Verschlüsselung Kommunikation auf allen Ports der Domain.
# Nginx HSTS aktivieren
add_header Strict-Transport-Security "max-age=31536000;";
# Nginx HSTS Wildcard Zertifikat aktivieren
add_header Strict-Transport-Security "max-age=31536000; includeSubdomains;";
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