[OSM-talk] a, b and c.tile.openstreetmap.org refer to the same server?

[Svavar Kjarrval]

The problem the "feature" was supposed to solve is more or less solved
in HTTP/2. However, the specification was only formally published this
month so the a/b/c subdomains will probably need to be active for some
time longer due to older software (eg. browsers) which will probably not
utilise HTTP/2 for some time or not at all.

- Svavar Kjarrval

On 17/05/15 15:09, Jochen Topf wrote:
> On So, Mai 17, 2015 at 04:46:24 +0200, Maarten Deen wrote:
>> Is it normal that the a, b and c.tile.openstreetmap.org IP-adresses refer to
>> the same server? For me, they all refer to amsterdam.tile.openstreetmap.org
>> and for some reason it is not responding very well (lots of read times out
>> messages in JOSM).
>> To me it would seem more logical to have different tileserveraliases refer
>> to different physical servers.
> Thats normal. The a/b/c stuff is a workaround for a "feature" in browsers that
> only allow a limited number of connections to the same host at the same time.
> (Modern browsers probably don't have this limitation any more, sombody should
> probably check whether we need the a/b/c stuff any more.) It is not ment to
> be some kind of load-balancing.
>
> And in this case it wouldn't really help to make those aliases to different
> servers. If one of them is slow your map will still be patchy.
>
> Jochen


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