Bjørn,
Thanks for the info. I'm not sure if I should file an Issue on the doc for the
broken link, or on the demo for the missing file (no public GitHub repository
for the demo?).
While testing the GeoMoose/OpenLayers client, I did see foreign WMS servers
(not under my control) cause a "Cross-Origin Request Blocked" error. This was
unexpected as I had encoded the XML SLD document and included it in the GET
request parameter SLD_BODY. I could understand getting the error if I had used
the alternative method of instead using SLD=http://... to reference an SLD
document somewhere on the web, but I did not use that method. I even removed
the reference links in the header of the SLD, but I got the same error.
Thanks again!
Brent Fraser
From: "Bjørn Ove Grøtan"
Sent: 12/31/22 5:47 AM
To: Brent Fraser
Cc: "mapserver-users@lists.osgeo.org"
Subject: Re: [MapServer-users] Link in SLD doc returns an exception
Brent Fraser:
> Hi All,
>
> I'm experimenting with SLD and reading the MapServer doc. On the SLD page
> under Server Side Support, it says "Test the remote SLD request" with a link
> to
>
> https://demo.mapserver.org/cgi-bin/wms?SERVICE=wms=1.1.1=GetMap=country_bounds=png=400=300=EPSG:4326==-180.0,-90.0,180.0,90.0=TRUE=https://demo.mapserver.org/ogc-demos/map/sld/sld_line_simple.xml
>
> The link looks good but it returns an exception:
>
>
> "http://schemas.opengis.net/wms/1.1.1/exception_1_1_1.dtd;>
>
>
> msSLDApplySLDURL: WMS server error. Could not open SLD
> https://demo.mapserver.org/ogc-demos/map/sld/sld_line_simple.xml and save it
> in a temporary file. Please make sure that the sld url is valid and that the
> temporary path is set. The temporary path can be defined for example by
> setting TEMPPATH in the map file. Please check the MapServer documentation on
> temporary path settings.
> msHTTPExecuteRequests(): HTTP request error. HTTP GET request failed with
> status 404 () for
> https://demo.mapserver.org/ogc-demos/map/sld/sld_line_simple.xml
>
>
>
> Is the demo in a repo somewhere or does someone have some insight? Thanks!
The error message is correct,
https://demo.mapserver.org/ogc-demos/map/sld/sld_line_simple.xml returns a 404
Page not found, The root folder at /ogc-demos/ has been removed at some point.
Be aware though, that not all WMS-servers allow (by configuration) external
hosted SLD-files due to potential XXE (XML eXternal Entity) vulnerability,
Also might be of interrest: the Mapserver implementation of GetStyle-request
(return SLD for a given layer) has some limitations on line-symbols where
images (png) are placed along the line symbol, and same with polygon fills
using a repeated png-file as fill - but simple polygon symbologies with a solid
fill color works as expected.
--
Kind regards
Bjørn Ove Grøtan
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