HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Loadable-Components is a library to solve the React code-splitting client-side and server-side.
Progressive Web Apps (PWAs) are web apps built and enhanced with modern APIs to deliver enhanced capabilities, reliability, and installability while reaching anyone, anywhere, on any device, all with a single codebase.
Varnish is a reverse caching proxy.