A model (developed by Leonard Richardson) that breaks down the principal elements of a REST approach into three steps. These introduce resources, http verbs, and hypermedia controls.

Serving static files in golang http server tutorial.

http4s is a minimal, idiomatic Scala interface for HTTP services. http4s is Scala's answer to Ruby's Rack, Python's WSGI, Haskell's WAI, and Java's Servlets.

HATEOAS (Hypermedia as the Engine of Application State) is a constraint of the REST application achitecture. A hypermedia-driven site provides information to navigate the site's REST interfaces dynamically by including hypermedia links with the responses. This capability differs from that of SOA-based systems and WSDL-driven interfaces. With SOA, servers and clients usually must access a fixed specification that might be staged somewhere else on the website, on another website, or perhaps distributed by email.