Revision 1.1.0 (2023-01-05)
About: This plugin enables you to set Security Headers for your website and make your website safer for use.
Upgrade the Security of your site to A level.
Content-Security-Policy is tricky, because of (possible) inline CSS and JS in Piwigo or its plugins, which can break if CSP is set wrongly.
Changes: Added config for strict-transport-security directive, contributed by @Vodkapic