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<p>Hi Andreas,</p>
<p>Another problem you may hit - the link below is hitting it being
~2300 chars - URL's (and thus GET requests) cannot reliably be
more than about 2000 characters long. At that point you need to
shift over to POST requests (and I think GetMap is GET only...).</p>
<p><a class="moz-txt-link-freetext" href="https://stackoverflow.com/questions/417142/what-is-the-maximum-length-of-a-url-in-different-browsers">https://stackoverflow.com/questions/417142/what-is-the-maximum-length-of-a-url-in-different-browsers</a><br>
</p>
<p>Cheers,</p>
<p>Jonathan<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2019-04-09 16:07, Andreas Neumann
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:9e2b63f95b6c91326ff40c085e997b0e@carto.net">Hi Paul <br>
Thanks - now I know that I have to use SLD_BODY for the case where
the
<br>
SLD is in the URL. <br>
Another QGIS-Server specific question: <br>
Can I count on it that the SLD output by QGIS server with the
GetStyles
<br>
request can also be consumed again by QGIS server? What about
complex
<br>
styles (e.g. something with a style that can't easily be
represented by
<br>
SLD). If I first consume the styles from QGIS server, then filter
and
<br>
send back, would the complex styles potentially be lost/destroyed?
<br>
Again: our intent here is merely to filter categories, not to
change the
<br>
styles. <br>
Thanks,
<br>
Andreas <br>
On 2019-04-09 16:28, pblottiere wrote:
<br>
<br>
<blockquote type="cite">Hi Andreas, <br>
<blockquote type="cite">Can you point me to an example how to
create a valid GetMap request with an SLD submitted? </blockquote>
<br>
There's a basic example in unit tests:
<a class="moz-txt-link-freetext" href="https://github.com/qgis/QGIS/blob/master/tests/src/python/test_qgsserver_wms_getmap.py#L1309-L1325">https://github.com/qgis/QGIS/blob/master/tests/src/python/test_qgsserver_wms_getmap.py#L1309-L1325</a><br>
<br>
Regards,
<br>
<br>
Paul <br>
On 4/9/19 4:14 PM, Andreas Neumann wrote: <br>
Hi, <br>
I did some test: <br>
Here is a long URL with the SLD (originally sent by QGIS server,
stripped away some RULES manually) and sending it back in a
GetMap request: <br>
<br>
</blockquote>
<a class="moz-txt-link-freetext" href="https://services.geo.zg.ch/ows-oereb/Grundwasserschutz?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&BBOX=2682932,1225299,2684213,1226054&CRS=EPSG:2056&WIDTH=1615&HEIGHT=952&LAYERS=ch.zg.grundwasserschutz.gwszonen&STYLES=&FORMAT=image/png&DPI=96&MAP_RESOLUTION=96&FORMAT_OPTIONS=dpi:96&TRANSPARENT=TRUE&SLD=%3CStyledLayerDescriptor+xmlns%3D%22http%3A%2F%2Fwww.opengis.net%2Fsld%22+xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22+xmlns%3Axsi%3D%22http%3A%2F%2Fwww.w3.org%2F2001%2FXMLSchema-instance%22+xsi%3AschemaLocation%3D%22http%3A%2F%2Fwww.opengis.net%2Fsld+http%3A%2F%2Fschemas.opengis.net%2Fsld%2F1.1.0%2FStyledLayerDescriptor.xsd%22+xmlns%3Ase%3D%22http%3A%2F%2Fwww.opengis.net%2Fse%22+version%3D%221.1.0%22+xmlns%3Aogc%3D%22http%3A%2F%2Fwww.opengis.net%2Fogc%22%3E%0D%0A+%3CNamedLayer%3E%0D%0A++%3Cse%3AName%3Ech.zg.grundwasserschutz.gwszonen%3C%2Fse%3AName%3E%0D%0A++%3CUserStyle%3E%0D%0A+++%3Cse%3AName%3Edefault%3C%2Fse%3AName%3E%0D%0A+++%3Cse%3AFeatureTypeStyle%3E%0D%0A++++%3Cs">https://services.geo.zg.ch/ows-oereb/Grundwasserschutz?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&BBOX=2682932,1225299,2684213,1226054&CRS=EPSG:2056&WIDTH=1615&HEIGHT=952&LAYERS=ch.zg.grundwasserschutz.gwszonen&STYLES=&FORMAT=image/png&DPI=96&MAP_RESOLUTION=96&FORMAT_OPTIONS=dpi:96&TRANSPARENT=TRUE&SLD=%3CStyledLayerDescriptor+xmlns%3D%22http%3A%2F%2Fwww.opengis.net%2Fsld%22+xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22+xmlns%3Axsi%3D%22http%3A%2F%2Fwww.w3.org%2F2001%2FXMLSchema-instance%22+xsi%3AschemaLocation%3D%22http%3A%2F%2Fwww.opengis.net%2Fsld+http%3A%2F%2Fschemas.opengis.net%2Fsld%2F1.1.0%2FStyledLayerDescriptor.xsd%22+xmlns%3Ase%3D%22http%3A%2F%2Fwww.opengis.net%2Fse%22+version%3D%221.1.0%22+xmlns%3Aogc%3D%22http%3A%2F%2Fwww.opengis.net%2Fogc%22%3E%0D%0A+%3CNamedLayer%3E%0D%0A++%3Cse%3AName%3Ech.zg.grundwasserschutz.gwszonen%3C%2Fse%3AName%3E%0D%0A++%3CUserStyle%3E%0D%0A+++%3Cse%3AName%3Edefault%3C%2Fse%3AName%3E%0D%0A+++%3Cse%3AFeatureTypeStyle%3E%0D%0A++++%3Cs</a>
<br>
e%3ARule%3E%0D%0A+++++%3Cse%3AName%3EGrundwasserschutzzone+S1%3C%2Fse%3AName%3E%0D%0A+++++%3Cse%3ADescription%3E%0D%0A++++++%3Cse%3ATitle%3EGrundwasserschutzzone+S1%3C%2Fse%3ATitle%3E%0D%0A+++++%3C%2Fse%3ADescription%3E%0D%0A+++++%3Cogc%3AFilter+xmlns%3Aogc%3D%22http%3A%2F%2Fwww.opengis.net%2Fogc%22%3E%0D%0A++++++%3Cogc%3APropertyIsEqualTo%3E%0D%0A+++++++%3Cogc%3APropertyName%3Etyp_code%3C%2Fogc%3APropertyName%3E%0D%0A+++++++%3Cogc%3ALiteral%3ES1%3C%2Fogc%3ALiteral%3E%0D%0A++++++%3C%2Fogc%3APropertyIsEqualTo%3E%0D%0A+++++%3C%2Fogc%3AFilter%3E%0D%0A+++++%3Cse%3APolygonSymbolizer%3E%0D%0A++++++%3Cse%3AFill%3E%0D%0A+++++++%3Cse%3ASvgParameter+name%3D%22fill%22%3E%23003bb3%3C%2Fse%3ASvgParameter%3E%0D%0A++++++%3C%2Fse%3AFill%3E%0D%0A++++++%3Cse%3AStroke%3E%0D%0A+++++++%3Cse%3ASvgParameter+name%3D%22stroke%22%3E%23000080%3C%2Fse%3ASvgParameter%3E%0D%0A+++++++%3Cse%3ASvgParameter+name%3D%22stroke-width%22%3E1%3C%2Fse%3ASvgParameter%3E%0D%0A+++++++%3Cse%3ASvgParameter+name%3D%22stroke-linej
<br>
oin%22%3Ebevel%3C%2Fse%3ASvgParameter%3E%0D%0A++++++%3C%2Fse%3AStroke%3E%0D%0A+++++%3C%2Fse%3APolygonSymbolizer%3E%0D%0A++++%3C%2Fse%3ARule%3E%0D%0A+++%3C%2Fse%3AFeatureTypeStyle%3E%0D%0A++%3C%2FUserStyle%3E%0D%0A+%3C%2FNamedLayer%3E%0D%0A%3C%2FStyledLayerDescriptor%3E
<blockquote type="cite">
<br>
The response is:
<br>
<br>
<ServiceExceptionReport xmlns=<a class="moz-txt-link-rfc2396E" href="http://www.opengis.net/ogc">"http://www.opengis.net/ogc"</a>
version="1.3.0"> <br>
<ServiceException code="Invalid Parameter"> SLD
('<StyledLayerDescriptor xmlns=<a class="moz-txt-link-rfc2396E" href="http://www.opengis.net/sld">"http://www.opengis.net/sld"</a>
[1] xmlns:xlink=<a class="moz-txt-link-rfc2396E" href="http://www.w3.org/1999/xlink">"http://www.w3.org/1999/xlink"</a> [2]
xmlns:xsi=<a class="moz-txt-link-rfc2396E" href="http://www.w3.org/2001/XMLSchema-instance">"http://www.w3.org/2001/XMLSchema-instance"</a> [3]
xsi:schemaLocation=<a class="moz-txt-link-rfc2396E" href="http://www.opengis.net/sldhttp://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd">"http://www.opengis.net/sld
http://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd"</a>
[4] xmlns:se=<a class="moz-txt-link-rfc2396E" href="http://www.opengis.net/se">"http://www.opengis.net/se"</a> [5] version="1.1.0"
xmlns:ogc=<a class="moz-txt-link-rfc2396E" href="http://www.opengis.net/ogc">"http://www.opengis.net/ogc"</a> [6]>
<NamedLayer>
<se:Name>ch.zg.grundwasserschutz.gwszonen</se:Name>
<UserStyle> <se:Name>default</se:Name>
<se:FeatureTypeStyle> <se:Rule>
<se:Name>Grundwasserschutzzone S1</se:Name>
<se:Description> <se:Title>Grundwasserschutzzone
S1</se:Title> </se:Description> <ogc:Filter
xmlns:ogc=<a class="moz-txt-link-rfc2396E" href="http://www.opengis.net/ogc">"http://www.opengis.net/ogc"</a> [6]>
<ogc:PropertyIsEqualTo>
<ogc:PropertyName>typ_code</ogc:PropertyName>
<ogc:Literal>S1</ogc:Literal>
</ogc:PropertyIsEqualTo> </ogc:Filter>
<se:PolygonSymbolizer> <se:Fill> <se:SvgParameter
name="fill">#003bb3</se:SvgParameter> </se:Fill>
<se:Stroke> <se:SvgParameter
<br>
</blockquote>
name="stroke">#000080</se:SvgParameter>
<se:SvgParameter
name="stroke-width">1</se:SvgParameter>
<se:SvgParameter
name="stroke-linejoin">bevel</se:SvgParameter>
</se:Stroke> </se:PolygonSymbolizer> </se:Rule>
</se:FeatureTypeStyle> </UserStyle>
</NamedLayer> </StyledLayerDescriptor>') cannot be
converted into QString
<blockquote type="cite"></ServiceException>
</ServiceExceptionReport> <br>
So apparently the SLD cannot be converted to a QString. Is my
encoding in the URL above wrong or am I missing a required
additional parameter? <br>
Can you point me to an example how to create a valid GetMap
request with an SLD submitted? <br>
Thanks a lot, Andreas <br>
On 2019-04-09 15:38, Andreas Neumann wrote: <br>
Hi, <br>
Does QGIS-Server support SLD styles to filter away RULEs in a
GetMap Request? <br>
I would assume, yes, but in what encoding would I submit such an
SLD in a GET request? I know that one should rather use POST
reqests for such long parameters, but for experimenting, it
would be ok to use GET. <br>
The idea would be to allow users to enable/disable categories
within a given layer. <br>
The WMS client would first request the available rules with a
GetStyles command (that part works fine) and would then filter
the RULE (strip away the unwanted RULEs) and resubmit the GetMap
with an SLD. Does that work with QGIS server? <br>
I know that one can also use the FILTER parameter, but we want
to do it in an OGC compatible way, since the client being
developed should work with any OGC compatible WMS server. <br>
Thanks for your reply, <br>
Andreas _______________________________________________
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<br>
Links:
<br>
------
<br>
[1] <a class="moz-txt-link-freetext" href="http://www.opengis.net/sld">http://www.opengis.net/sld</a>
<br>
[2] <a class="moz-txt-link-freetext" href="http://www.w3.org/1999/xlink">http://www.w3.org/1999/xlink</a>
<br>
[3] <a class="moz-txt-link-freetext" href="http://www.w3.org/2001/XMLSchema-instance">http://www.w3.org/2001/XMLSchema-instance</a>
<br>
[4]
<br>
<a class="moz-txt-link-freetext" href="http://www.opengis.net/sldhttp://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd">http://www.opengis.net/sldhttp://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd</a>
<br>
[5] <a class="moz-txt-link-freetext" href="http://www.opengis.net/se">http://www.opengis.net/se</a>
<br>
[6] <a class="moz-txt-link-freetext" href="http://www.opengis.net/ogc">http://www.opengis.net/ogc</a>
<br>
<br>
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