I have reviewed this document as part of the Ops area directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the Ops area directors. Document editors and WG chairs should treat these comments just like any other last call comments. This document provides examples of the API structure between client and captive server. The document is well written. I just have a question: What improvement does the proposed API have over today's existing communication between clients and Captive Server(s)? Captive servers have been deployed everywhere, like airport or restaurants trying to access free WIFI. What problems does the existing method have to justify this newly proposed APIs? Cheers, Linda Dunbar