Beehiiv RSS feed is a feature of the Beehiiv. Beehiiv is a relatively young, hosted newsletter platform built for businesses and creators.
Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Vercel is a cloud platform for static frontends and serverless functions.