[Tilesathome] How does a client return an unhandled request to the server?

[Norbert Wenzel]

Hi,

I was just wondering how a client returns an unhandled request to the 
server. At the moment my user page[0] shows two tiles I render at the 
moment.

x,y		zoom	Priority	Last client activity	
2234,1420	12-17	2		3 hours, 18 minutes
2162,1324	12-17	1		15 minutes	

Both are rendered with the same client UUID (I have only one at the 
moment). So the first question would be, does the t at h client render two 
or more tilesets at the same time in the standard configuration? If it 
does not, shouldn't it cancel all requests of a client (UUID) when 
handing out a new one?

I often fail to render large requests (cities, 2234/1420 is Vienna, 
2162,1324 is Hamburg) because the download often fails. But usually my 
client does not tell the server there was an error, but it seems to let 
those tiles time out on the server side.

I just changed a few things in Vienna and wanted to rerender it, which 
of course is not possible, since the server thinks I do render it at the 
moment, which I know isn't happening at all.

So as far as I remember there is a way the client tells the server about 
failed requests. Is that possibility not used or does my client really 
try to render Vienna in the background?

Norbert

[0] http://tah.openstreetmap.org/User/show/byid/236/
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