Re: [squid-users] anyone knows some info about youtube "range" parameter?

On 25/04/2012 06:02, Amos Jeffries wrote:
> On 25/04/2012 6:02 a.m., Eliezer Croitoru wrote:
>> as for some people asking me recently about youtube cache i have
>> checked again and found that youtube changed their video uris and
>> added an argument called "range" that is managed by the youtube player.
>> the original url\uri dosnt include range but the youtube player is
>> using this argument to save bandwidth.
>>
>> i can implement the cahing with ranges on nginx but i dont know yet
>> the way that range works.
>> it can be based on user bandwidth or "fixed" size of chunkes.
>>
>> if someone up to the mission of analyzing it a bit more to understand
>> it so the "range" cache will be implemented i will be happy to get
>> some help with it.
>>
>> Thanks,
>> Eliezer
>>
>>
>
> I took a look at it a while back...
>
> I got as far as determining that the "range" was roughly byte-ranges as
> per the HTTP spec BUT (and this is a huge BUT). Each response was
> prefixed with some form of file intro bytes. Meaning the rages were not
> strictly sub-bytes of some original object. At this point there is no
> way for Squid to correctly generate the intro bytes, or to merge/split
> these "ranges" for servicing other clients.
>
> When used the transfer is relatively efficient, so the impact of
> bypassing the storeurl cache feature is not too bad. The other option is
> to re-write the URL without range and simply reply with the whole video
> regardless. It is a nasty mapping problem with bandwidth waste either way.
>
they have changed something in the last month or so.
the was using a "begin"
and now they are usinn " "rang=13-X" 13 is the first..
i was thinking also on rewriting the address cause it works perfectly
with my testing.

will update more later.

Eliezer
> That was a year or two ago, so it may be worth re-investigating.
>
> Amos

-- 
Eliezer Croitoru
https://www1.ngtech.co.il
IT consulting for Nonprofit organizations
eliezer <at> ngtech.co.il