Connectors

The types of connectors are client, server, cache, resolver, and tunnel. You can think of connectors as interfaces. They abstract how components communicate. A connector's job in the REST architecture is to enable the retrieving of resource representations as well as exposing resources. REST is stateless; every request will have to carry all the information that is required for the server to process the request from the client.

Let's look at the model that REST uses to process a request. The request can be compared to a stored procedure:

-Architectural Styles and the Design of Network-based Software Architectures by Roy T. Fielding, section 5.2.1.2, page 109