REST HATEOAS with Spring The Richardson maturity model breaks the REST architectural style into various levels of maturity. Level zero describes a system that uses HTTP as a transport mechanism only (also known as URI tunnelling). A single URI and HTTP verb is typically used for all interactions with POX (plain old XML) being posted over the wire. Old school SOAP-RPC is a good level zero example. Level one describes a system that builds on level zero by introducing the notion of resources. Resources typically represent some business entity and are usually described using nouns. Each resource is addressed via a unique URI and a single [...]