I have reviewed this document as part of the security directorate's ongoing
effort to review all IETF documents being processed by the IESG.  Document
editors and WG chairs should treat these comments just like any other
comments.

The summary of the review is Ready with Nits.

*Security:*

While I'm not all that into ALTO, it seems to me that this draft is all
about messages and message exchanges between ALTO entities where the
security (authentication, encryption, ...) has been specified in previous
standards track documents such as RFC 7285. There are a few additional
security considerations which seem to be well covered by the Security
Considerations section of this draft.

*Nits:*

Section 1.0, Page 4:
OLD
functioning for HTTP/1.x. TIPS also provides an ALTO server to
NEW
functioning for HTTP/1.x. TIPS also provides for an ALTO server to

Section 2.1.1, Page 8: Seems too vague. A sentence about tips-view-uri
wouldn't hurt. At the bottom it says "Use the URI as above". Which URI
above? What exactly does "use" mean?

Section 2.2, Page 9, Figure 3: Figure looks kind of incomplete. Shouldn't
there be arrows from R1 to R2/R3?

Section 2.3, Page 10: In the text on "Information Resource Directory" the
first sentence is confusing. What is the thing that is requested to
discover? Maybe you should replace "Requested" at the start of the sentence
with "Produced when a server is requested"...

Section 2.3, Page 11 at top: That's Figure 4, not 1.

Section 2.4, Page 12, 1st paragraph: I think a service runs "over" a
connection, not "inside" a connection.

Section 4.4, Page 23: Seems kind of feeble. How about, given that a
disconnect is treated as a DELETE, something like the following, which
probably implies that the server maintains a use count. (This document need
not mention such a count.)
OLD
set associated with the TIPS view. A server will not want to delete
NEW
set associated with the TIPS view. A server MUST NOT delete


Thanks,
Donald
===============================
 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 2386 Panoramic Circle, Apopka, FL 32703 USA
 d3e3e3@gmail.com