[talk-au] ISP caching problems with JOSM ?

Grant Slater openstreetmap at firefishy.com
Thu Sep 12 13:15:15 UTC 2013

Hi Ian,

The api.openstreetmap.org map data servers send "no-cache" headers and
proxy/caches should therefore NOT be caching the results...
But some ISPs are too aggressive with their caching.

Make sure JOSM is set to the default OSM server (there are 3rd party
caching API servers available):
JOSM -> Edit -> Preferences (shortcut: F12) -> Connection Settings
(World Icon) -> make sure: "User the default OSM server URL" is

I am happy to help diagnose the error with you.


On 12 September 2013 13:01, Steer <isteer at iinet.net.au> wrote:
> I’m wondering if I’m striking caching problems with my ISP or my PC.  I make
> changes and upload them with no error messages and close JOSM.  I re-open
> the next day, and my changes aren’t there – but they are present in the
> “slippy map”.  I re-do them and upload them and get a conflict saying the
> server version is newer than mine.  I can close JOSM, re-open and
> re-download, and the server version and my version don’t change.
> I have googled this problem, but it was all a bit above my head.  Does
> anyone have a solution for this problem they can describe in simple terms ?
> J
> thanks
> Ian
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