Reviewer: Sheng Jiang
Review result: Ready with Nits

I have reviewed this document as part of the OPS directorate's ongoing
effort to review all IETF documents being processed by the IESG. Comments that
are not addressed in last call may be included in AD reviews during the IESG
review. Document editors and WG chairs should treat these comments just like
any other last call comments.

Document: draft-ietf-alto-new-transport-07
Reviewer: Sheng Jiang
Review Date: 2023-04-04
Result: Ready with Nits

This document intents for Standards Track. It  document specifies a new 
ALTO Transport Information Publication Service (TIPS), which takes advantage
of HTTP/2 and later versions already support concurrent, non-blocking 
transport of multiple streams in the same HTTP connection. This document 
is well-written and READY with minor Nits (below) for publication.

In section 2.5 "TIPS With HTTP/1.x". This document claims "TIPS
   still functions with HTTP/1.x for client pull functionality only,
   with the limitation that it cannot cancel any outstanding requests or
   fetch resources concurrently over the same connection." However, it is
unclear what operations/procedure defined in this document will fail when
TIPS work over HTTP/1.x (also whether there are scenarios the server/client
have to fall back to HTTP/1.x), the signal or error code the TIPS will
provide, and how the server and client should act when these failures happen.

This looks like an operational hole that authors must fill before publication.
However, I am not sure, if there is no scenarios that the server/client have 
to fall back to HTTP/1.x, the authors may simply declare the TIPS SHOULD not 
work with HTTP/1.x.