Then you should know what happens to a reverse proxy when you have a cache miss, the request doesn't fail, it just gets transparently proxied off to the upstream server that does have the content.
--Damian On Fri, Jun 16, 2017 at 3:07 PM, Mark Smith <[email protected]> wrote: > On 16 June 2017 at 16:35, Damian Guppy <[email protected]> wrote: > > Akamai is a caching network. DNS does not provide the sort of > intelligence > > necessary to direct requests to the most appropriate server, so you will > > always just hit the server closest to you. If that server happens to have > > the content already cached then it will serve it up itself. If it doesn't > > have some or all of the content required (cache miss) the server will > act as > > a proxy and fetch the content from the closest upstream server on the > akamai > > network that does have the content, and then hold onto it for an amount > of > > time as defined by their internal algorithms in case anyone else needs > that > > content. > > > > *this is a simplified explanation of what is a complex system* > > You might want to look up the the expression "Teaching grandmother to > suck eggs". > > I've worked on the assumption that CDNs, given the amount of storage > that CDN nodes have (I've seen a few in person), and that ISPs have > had their own translucent web proxies in the past, have content > proactively replicated to them so that there is no latency, even for > the first request. > > > > > Thanks > > --Damian > > > > On Fri, Jun 16, 2017 at 2:29 PM, Tim Raphael <[email protected]> > > wrote: > >> > >> Mark, > >> > >> You’ll find that Akamai’s algorithms will retrieve the content from the > >> origin and keep it at varying stages of “warm” in their caches based on > >> demand. > >> > >> I’d be pretty unimpressed if I was a US / EU journo trying to get > >> Australian news from a webpage 500+ms RT away. > >> > >> - Tim > >> > >> > >> > On 16 Jun 2017, at 4:25 pm, Mark Smith <[email protected]> > wrote: > >> > > >> > On 16 June 2017 at 16:10, Scott Howard <[email protected]> wrote: > >> >> On Thu, Jun 15, 2017 at 10:57 PM, Mark Smith <[email protected] > > > >> >> wrote: > >> >>> > >> >>> I think an interesting example is www.theage.com.au. You would > expect > >> >>> the main site to be hosted somewhere inside Australia, yet it is > being > >> >>> hosted by Akamai somewhere in Europe. > >> >> > >> >> > >> >> Want to think about that comment a little more? > >> >> > >> > > >> > Not really, didn't think much about it before. > >> > > >> > Perhaps it it is surprising that Akamai are hosting copies of content > >> > a long way away from where it is going to be popularly read. There > >> > can't be that many readers of The Age in Europe. > >> > > >> > I don't know anything about Akamai's service optons, and whether > >> > customers can choose where their content is held or provide an > >> > indication of where the content is most likely consumed. > >> > > >> > If not, it might indicate Akamai's replication strategy could be copy > >> > everything everywhere or perhaps at least one copy in each continent. > >> > Cheap enough to do in terms of storage and network bandwidth, just a > >> > bit of a surprise it isn't more optimal. > >> > > >> >> Where do you think urlscan.io is hosted? How does Akamai work? > >> >> > >> >> Scott > >> > _______________________________________________ > >> > AusNOG mailing list > >> > [email protected] > >> > http://lists.ausnog.net/mailman/listinfo/ausnog > >> > >> _______________________________________________ > >> AusNOG mailing list > >> [email protected] > >> http://lists.ausnog.net/mailman/listinfo/ausnog > > > > >
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