Re: [MMUSIC] RTSP: Proxies and handling of unknown methods, headers and transport parameters

["HAAS Christian" <Christian.Haas at frequentis.com>]

Hello!

-----Original Message-----
From: mmusic-bounces at ietf.org [mailto:mmusic-bounces at ietf.org] On Behalf Of
Magnus Westerlund

> Methods:
> [...]
> Thus I suggest that we leave this as currently specified. Any objections?

Sounds ok; I don't even see a problem with logging proxies, since their prime
purpose is to log any message - and a minimum feature is grouping them
together according to CSeq and/or Session Ids, which should be enough for any
extension.


> Headers:
> [...]
> My proposal for proxies is that they forward unknown headers and when
> defining a header that a proxy needs to understand one uses a feature
> tag that is put in the Proxy-Require header. [...]

Ok. Would there be some guidelines as to which types of proxies to consider
for specifying a new feature (and its tag)?


> Transport specifications:
> [...]
> A RTSP agent receiving a request with a Transport header SHALL
> ignore all transport specifications that contains unknown transport
> parameters. That way in case there are multiple transport
> specifications in the header the entity can strip away the ones
> that contains unknown things. [...]

Does "strip away" for a (concerned) proxy mean filtering the unknown
transport type out before passing the message on? (Or just "don't try to
interpret, just pass it on")?
For clarity, I'd suggest the writing that a concerned proxy removes
transports unknown to it - if that leaves the header empty, an immediate
Transport Not Supported response is generated.
This is of course highly dependant on intercepting (and the presence of)
corresponding Required headers...

Regards,
ch
____________________________________________________
Christian Haas
Team DIVOS, Software Engineer
FREQUENTIS AG

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