Re: Live Byte Ranges
Craig Pratt <email@example.com> Mon, 28 November 2016 21:11 UTC
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References: <CAOdDvNrrLfh0yV4UdBN_HpHNfD024Kufibe3D4ZB1N-SqYVt4g@mail.gmail.com> <firstname.lastname@example.org>
From: Craig Pratt <email@example.com>
Organization: Caspia Consulting
Date: Mon, 28 Nov 2016 13:06:13 -0800
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Subject: Re: Live Byte Ranges
X-Mailing-List: <email@example.com> archive/latest/33026
On 11/28/16 11:52 AM, Poul-Henning Kamp wrote:
I should add that I'm going to submit a patch to Rygel (the Gnome media streaming package) to support this draft as well.-------- In message <CAOdDvNrrLfh0yV4UdBN_HpHNfD024Kufibe3D4ZB1N-SqYVt4g@mail.gmail.com> , Patrick McManus writes:To summarize briefly - this addresses the problem of addressing byte ranges of dynamic (growing) content. A number of solutions have seen false starts in this space previously, but this one has a shot at being compatible with existing infrastructure.Varnish will almost certainly implement whatever comes out of this.
Agreed. I wish there was a better way. Maybe the rust can be cleaned off of Range Units by filing some bugs against implementations that are making assumptions about Range Units. Even if it's not used/helpful here, it might open the door for some other applications.Notes from our mumblings in the project: The "Very Large Value" solution it is brittle in more ways than is desirable, but try as we may, we don't see any simpler/better ways of doing it without negotiation/hints.
I thought about the magic value approach. It's certainly more deterministic to use a Quite Large Magic Value (QLMV?) - and easier to specify and code. And it's entertaining to think up magic values (e.g. 2^63 - 42) (but agreed that all 9s does a better job of jumping out to us humans). I just couldn't suppress my engineering gag reflex at the whole concept. This reflex has some adjustment, but I'm presuming it's a common reaction.We suggest to either put a "Quite Large" lower limit on "Very Large Value", or better yet: Make it a magic value large enough to not be a problem relative to actual Range requests. If we keep with the 9's motif from the draft, we suggest 999999999999999999 which doesn't needlessly provoke 64-bit sign issues.
I also didn't like the idea of forcing a limit. But 2^63 is a crazy-large number. At 50Mb/s, the representation could cover over 46000 years, according to my quick math (with 999999999999999999 covering a mere 5073 years). And there's nothing preventing the definition/addition of a VLMV now or later. I just can't help but wonder if a Registry of Magic Values would then be in order (there's that gag reflex again).
Anyway, I'm good either way so long as there's general consensus. I tried to cover the issue of values larger than 2^63 in the Security Considerations section. Perhaps a "should" or recommended QLMV/VLMVs would be a way to go? Other thoughts/opinions appreciated here.
Thanks. It'll be corrected in the next version. (Somehow "accessable" is in my mac's spelling dictionary)Typo on page 3: "accessable"