I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the security area directors. Document editors and WG chairs should treat these comments just like any other last call comments. Document reviewed: draft-ietf-httpbis-priority-10 This document is ready for publication as a Proposed Standard RFC This document is easy to read, and appears straightforward to implement (though there are complications for implementors that the document does a good job of exploring). The mechanism improves the overall robustness of the HTTP protocol family.