All in One SEO plugin optimizes WordPress website and its content for search engines.
Aruba.it is an Italian company mainly active in the web hosting and domain registration businesses.
cdnjs is a free distributed JS library delivery service.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web.