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WMS hangs sometimes, Timeouts

4 messages

WMS hangs sometimes, Timeouts

Reply Threaded

Hi,

I extensively use WMS to display raster data. The WMS is inhouse (in the
same LAN). Unfortunately, I experience timeouts quite frequently, in
average every 10 pan/zooms QGIS hangs, waits for 1-2 minutes and then
displays an error message about a HTTP-Exception, also displaying the URL.
When I copy/paste the URL to a web-browser, the link just works fine and
loads immediately.

The thing is that the WMS just works fine from other web-based
applications and never hangs. I wonder what may be wrong with the way QGIS
retrieves the WMS results and why it may hang so frequently?

We have a proxy to access the internet, but I added our own WMS as a proxy
exception, so it shouldn't go through the proxy.

Do other people have the same problems?

I am testing with latest trunk builds on Windows XP and Linux. Similar
problems/results. The problem existed for a while with the trunk builds.

Thanks for any hints on what we could do/try to resolve the issue. I will
test the WMS with other clients (gvSig or uDig) to see if it hangs there
as well or not.

Andreas

--
Andreas Neumann
http://www.carto.net/neumann/
http://www.svgopen.org/

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Marco Hugentobler

Re: WMS hangs sometimes, Timeouts

Reply Threaded

Hi Andreas

Is there a public WMS where it is possible to reproduce the hangs?
Maybe the browser has a different timeout setting and sends the request again
after a certain time.

Marco

Am Dienstag, 27. Oktober 2009 12.19:05 schrieb Andreas Neumann:

> Hi,
>
> I extensively use WMS to display raster data. The WMS is inhouse (in the
> same LAN). Unfortunately, I experience timeouts quite frequently, in
> average every 10 pan/zooms QGIS hangs, waits for 1-2 minutes and then
> displays an error message about a HTTP-Exception, also displaying the URL.
> When I copy/paste the URL to a web-browser, the link just works fine and
> loads immediately.
>
> The thing is that the WMS just works fine from other web-based
> applications and never hangs. I wonder what may be wrong with the way QGIS
> retrieves the WMS results and why it may hang so frequently?
>
> We have a proxy to access the internet, but I added our own WMS as a proxy
> exception, so it shouldn't go through the proxy.
>
> Do other people have the same problems?
>
> I am testing with latest trunk builds on Windows XP and Linux. Similar
> problems/results. The problem existed for a while with the trunk builds.
>
> Thanks for any hints on what we could do/try to resolve the issue. I will
> test the WMS with other clients (gvSig or uDig) to see if it hangs there
> as well or not.
>
> Andreas

--
Dr. Marco Hugentobler
HUGIS - GIS programming and consulting
Webereistrasse 66
CH-8134 Adliswil
[hidden email]
http://homepage.hispeed.ch/hugis
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Andreas Neumann

Re: WMS hangs sometimes, Timeouts

Reply Threaded

no, unfortunately this is inhouse only, at the current time. Maybe next
year it will be available. Maybe we can test next time you meet us in
Uster.

Or I'll install the WMS on my laptop and bring it along to the Vienna
hackfest.

Andreas

On Tue, October 27, 2009 5:25 pm, Marco Hugentobler wrote:

> Hi Andreas
>
> Is there a public WMS where it is possible to reproduce the hangs?
> Maybe the browser has a different timeout setting and sends the request
> again
> after a certain time.
>
> Marco
>
> Am Dienstag, 27. Oktober 2009 12.19:05 schrieb Andreas Neumann:
>> Hi,
>>
>> I extensively use WMS to display raster data. The WMS is inhouse (in the
>> same LAN). Unfortunately, I experience timeouts quite frequently, in
>> average every 10 pan/zooms QGIS hangs, waits for 1-2 minutes and then
>> displays an error message about a HTTP-Exception, also displaying the
>> URL.
>> When I copy/paste the URL to a web-browser, the link just works fine and
>> loads immediately.
>>
>> The thing is that the WMS just works fine from other web-based
>> applications and never hangs. I wonder what may be wrong with the way
>> QGIS
>> retrieves the WMS results and why it may hang so frequently?
>>
>> We have a proxy to access the internet, but I added our own WMS as a
>> proxy
>> exception, so it shouldn't go through the proxy.
>>
>> Do other people have the same problems?
>>
>> I am testing with latest trunk builds on Windows XP and Linux. Similar
>> problems/results. The problem existed for a while with the trunk builds.
>>
>> Thanks for any hints on what we could do/try to resolve the issue. I
>> will
>> test the WMS with other clients (gvSig or uDig) to see if it hangs there
>> as well or not.
>>
>> Andreas
>
> --
> Dr. Marco Hugentobler
> HUGIS - GIS programming and consulting
> Webereistrasse 66
> CH-8134 Adliswil
> [hidden email]
> http://homepage.hispeed.ch/hugis
>

--
Andreas Neumann
http://www.carto.net/neumann/
http://www.svgopen.org/

_______________________________________________
Qgis-user mailing list
[hidden email]
http://lists.osgeo.org/mailman/listinfo/qgis-user

Andreas Neumann

Re: WMS hangs sometimes, Timeouts

Reply Threaded

In reply to this post by Andreas Neumann

I am answering my own mail to let you know how we solved the problem.

It turned out that our WMS request went through our proxy, which caused
the more or less frequent hangs. I interpreted the proxy exclude list the
wrong way. It is a "starts-with", not a string "contains" URL filter - one
hast to include the "http://...." in the exclude list - otherwise the
request goes to the proxy specified (if turned on).

This has been clarified in the UI of the proxy settings now, to avoid
similar confusion for other users.

All fine now on my side and the WMS hangs disappeared by changing the
proxy exclude list accordingly. Also, performance is now better when
skipping the proxy.

Andreas

On Tue, October 27, 2009 12:19 pm, Andreas Neumann wrote: