This document will focus primarily on how the Content Steering server(s) make decisions about what information to provide the user agent. The protocol used to communicate between the Content Steering server and the user agent, and the semantics of those instructions are the focus of other initiatives. The primary exceptions to this are the 302 Request Routing mechanism, which by its nature is exposed directly to the User Agent, and the client probing mechanism, which is a new User Agent behavior described below.