[Qgis-user] Not valid data source on wms layer access for QGIS 3.8

[Andrea Peri]

Hi,
I load the network plugin and try with it.

I don't understand the result , but is why a really don't now how work
programmatically qgis.

I see when try to connetc to retrieve the list of layers , qgis send a
classic getcapabilities request.
This is the url invoked:
http://www502.regione.toscana.it/ows_ofc/com.rt.wms.RTmap/wms?map=owsofc&SERVICE=WMS&REQUEST=GetCapabilities

But when I try to add the choosed layer tothe map, I see from the network
plugin that qgis resend another getcapabilites request.
Sincerelly I don't understand why qgis is need to request still a
getcapabilites.
However meanwhile the first getcapabilies is read from network (this is
reported from the plugin), instead the second getcapabilies is taken from
the cache.
Infact, the plugin report me it is "used entry from cache".

I don't understand why this second getcapabilities is needed, but however I
have the cace set to ZERO.
I have this set because when I work to change sometimes on the wms server
to see the result I should empty the cache , so I prefer to have the cache
to zero. To have always the last from the network.

So I try to re-enable a lot of cache size.

AND NOW IT WORK.
But sincerelly I don't like to MUST HAVe ALWAYS the cache enabled to have a
workable wms.
Perhaps the real issue is to always use the cache without see that it is
set so ZERO.

However thx for the help.

Andrea.


Il giorno ven 5 lug 2019 alle ore 10:04 Richard Duivenvoorde <
rdmailings at duif.net> ha scritto:

> On 05/07/2019 08.18, Alessandro Pasotti wrote:
>
> > On Fri, Jul 5, 2019 at 8:13 AM Andrea Peri <aperi2007 at gmail.com
> >
> http://www502.regione.toscana.it/ows_ofc/com.rt.wms.RTmap/wms?map=owsofc
> >
> >     When I try to add it to a map canvas the connection return le list
> >     of layer .
> >     Choosing one and using the EPSG:3003.
> >     When Add to the canvas I see an error NOT VALID DATA SOURCE.
> >
> >     The same steps instead work correctly with the old QGIS 2.18.
> >
> >     Is this confirmed from some other one ?
>
> I'd say there is something wrong with the server (different endpoints?
> url rewriting? proxies?). Because depending on the time and version I
> get different results all the time:
> - started with QGIS Master and the normal WMS dialog: I saw 10 layers
> and could load the aerials
> - same session, I opened that node on the browser and then saw MUCH more
> layers (a lot of vector layers 'added') and could all load them
> - started 3.8 and saw the layers but could not load them
> - started master again and saw both in dialog and in browser only the 10
> layers
> - now I keep seeing only the 10 ortho's (and can load them both in
> Master and 3.8.0 which I have here.)
>
> This is the url QGIS fires:
>
> http://www502.regione.toscana.it/ows_ofc/com.rt.wms.RTmap/wms?map=owsofc&SERVICE=WMS&REQUEST=GetCapabilities
> as curl command
> curl
> '
> http://www502.regione.toscana.it/ows_ofc/com.rt.wms.RTmap/wms?map=owsofc&SERVICE=WMS&REQUEST=GetCapabilities
> '
> -H 'User-Agent: Mozilla/5.0 QGIS/3.9.0-Master'  --compressed
>
> My guess is there is something with the service...
>
> Can you maybe sent me a saved project with a layer that does not load
> with you?
> Can you try to install the QGIS Network logger plugin to see and check
> the url's (and replay the urls in the browser)
>
> Regards,
>
> Richard
>


-- 
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Andrea Peri
. . . . . . . . .
qwerty àèìòù
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