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RFC 4976, "Relay Extensions for the Message Sessions Relay Protocol (MSRP)", September 2007

Source of RFC: simple (rai)

Errata ID: 1273
Status: Held for Document Update
Type: Technical

Reported By: Alfred Hoenes
Date Reported: 2008-01-14
Held for Document Update by: Robert Sparks

Section 5.2 - pg.17 says:

<< 3rd message shown >>

    MSRP m4nbvx 200 OK
    To-Path: msrps://intra.example.com:9000/jui787s2f;tcp \
             msrps://alice.example.com:9892/98cjs;tcp
    From-Path: msrps://extra.example.com;tcp
|   Use-Path: msrps://intra.example.com:9000/jui787s2f;tcp \
|             msrps://extra.example.com:9000/mywdEe1233;tcp
    Authentication-Info:  [...]

<<  4th message shown >>
    MSRP m3nbvx 200 OK
    To-Path: msrps://alice.example.com:9892/98cjs;tcp
    From-Path: msrps://intra.example.com:9000/jui787s2f;tcp \
               msrps://extra.example.com;tcp
|   Use-Path: msrps://extra.example.com:9000/mywdEe1233;tcp \
              msrps://extra.example.com:9000/mywdEe1233;tcp
    Authentication-Info: [...]

It should say:

<< 3rd message >>
    MSRP m4nbvx 200 OK
    To-Path: msrps://intra.example.com:9000/jui787s2f;tcp \
             msrps://alice.example.com:9892/98cjs;tcp
    From-Path: msrps://extra.example.com;tcp
|   Use-Path: msrps://extra.example.com:9000/mywdEe1233;tcp
    Authentication-Info: [...]

<<  4th message >>
    MSRP m3nbvx 200 OK
    To-Path: msrps://alice.example.com:9892/98cjs;tcp
    From-Path: msrps://intra.example.com:9000/jui787s2f;tcp \
               msrps://extra.example.com;tcp
|   Use-Path: msrps://intra.example.com:9000/jui787s2f;tcp \
              msrps://extra.example.com:9000/mywdEe1233;tcp
    Authentication-Info: [...]

Notes:

In both messages, the "Use-Path:" header fields are garbled.

This should draw the attention to the lack of specification in the RFC
(cf. extra report) for the Relay behavior w.r.t. Use-Path in repsonses.

From descriptive text in the RFC it becomes clear that the 3rd message
above should contain one URI in the Use-Path header field, and that the
second one shown there in fact needs to be added by the relay into the
4th message (final response to the client).
The simple URI repetition shown in the 4th message doen not make sense
at all.

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