This document is a specification for the Background Intelligent Transfer Service (BITS) Peer-Caching: Content Retrieval Protocol. This is one protocol in a family of protocols that implement a distributed URL cache that is known as BITS peer-caching. Other protocols in the family are used to discover potential peers and to authenticate them. A client uses the BITS Peer-Caching: Content Retrieval Protocol to search an existing set of peers for content and to download from those peers.
Sections 1.5, 1.8, 1.9, 2, and 3 of this specification are normative. All other sections and examples in this specification are informative.