http://www.rfc-editor.org/rfc/rfc7975.txt
RFC 7975: Request Routing Redirection Interface for Content Delivery Network (CDN) Interconnection, B. Niven-Jenkins, R. van Brandenburg2016-10-01T23:00:00-00:00The Request Routing interface comprises (1) the asynchronous advertisement of footprint and capabilities by a downstream Content Delivery Network (CDN) that allows an upstream CDN to decide whether to redirect particular user requests to that downstream CDN; and (2) the synchronous operation of an upstream CDN requesting whether a downstream CDN is prepared to accept a user request and of a downstream CDN responding with how to actually redirect the user request. This document describes an interface for the latter part, i.e., the CDNI Request Routing Redirection interface.