[mapserver-users] WMS request fails when spaces are encoded as plus symbol in query part of URL

[Lime, Steve D (MNIT)]

Hmmm... Nice backwards compatibility ESRI. The +'s seem to still be quite legal (http://tools.ietf.org/html/rfc3986 and other references) in the query string (but not the path). I don't have access to test and I'm guessing these ideas won't work but they might be worth a quick try:

  1) Try encoding the wms_name in the metadata: "wms_name" "Topomap%20DRG%20250k"
  2) Don't set the wms_name in the metadata but add it to the connection: CONNECTION "http://ndgishub.nd.gov/arcgis/services/All_Elevation/MapServer/WMSServer?LAYERS=Topomap%20DRG%20250k&"

I'm betting MapServer will encode the %'s in 1 and throw an error in 2. Otherwise you could hack the MapServer source. Function is called msEncodeUrlExcept() in mapstring.c you can see the section to change starting at line 1138 in git master (https://github.com/mapserver/mapserver/blob/master/mapstring.c)<https://github.com/mapserver/mapserver/blob/master/mapstring.c).>

Maybe it's worth making this change as part of 7.0?

Steve


________________________________
From: mapserver-users-bounces at lists.osgeo.org [mapserver-users-bounces at lists.osgeo.org] on behalf of Moen, Paul T. [pmoen at nd.gov]
Sent: Tuesday, August 19, 2014 4:56 PM
To: mapserver-users at lists.osgeo.org
Subject: [mapserver-users] WMS request fails when spaces are encoded as plus symbol in query part of URL

Hi all,

We are consuming WMS services hosted by ESRI ArcGIS Server 10.0.  The server was upgraded to ArcGIS Server 10.2.2 and we no longer can access layer names with spaces.

This is the server’s capabilities.
http://ndgishub.nd.gov/arcgis/services/All_Elevation/MapServer/WMSServer?request=GetCapabilities&service=WMS

This is the layer I am using.

LAYER
# DEBUG 5
CONNECTIONTYPE WMS
CONNECTION "http://ndgishub.nd.gov/arcgis/services/All_Elevation/MapServer/WMSServer?"
METADATA
"wms_name" "Topomap DRG 250k"
"wms_format" "image/png"
"wms_server_version" "1.1.1"
"wms_srs" "EPSG:2266"
END
TYPE RASTER
STATUS OFF
NAME "USGS DRG 250k Topo Maps"
END

Mapserver encodes this request as follows.  Notice that the layer name, which is ‘Topomap DRG 250k’, is encoded with the spaces becoming the ‘+’ character.

http://ndgishub.nd.gov/arcgis/services/All_Elevation/MapServer/WMSServer?LAYERS=Topomap+DRG+250k&REQUEST=map&WMTVER=1.0.0&SERVICE=WMS&FORMAT=image/png&STYLES=&HEIGHT=1146&SRS=EPSG:2266&WIDTH=1271&BBOX=1906240.15992838,596656.333359479,2119730.85012732,789150.692893686&TRANSPARENT=TRUE&EXCEPTIONS=INIMAGE

This returns the error in an image that says “Parameter ‘layers’ contains unacceptable layer names.”

When I replace the + in the layer name with %20, LAYERS=Topomap+DRG+250k become LAYERS=Topomap%20DRG%20250k and the request becomes the following.

http://ndgishub.nd.gov/arcgis/services/All_Elevation/MapServer/WMSServer?LAYERS=Topomap%20DRG%20250k&REQUEST=map&WMTVER=1.0.0&SERVICE=WMS&FORMAT=image/png&STYLES=&HEIGHT=1146&SRS=EPSG:2266&WIDTH=1271&BBOX=1906240.15992838,596656.333359479,2119730.85012732,789150.692893686&TRANSPARENT=TRUE&EXCEPTIONS=INIMAGE

That request works.  Obviously, ESRI is no longer decoding + as a space and therefore does not recognize the layer name with spaces.

Is there any way I can have mapserver encode all characters using percent-encoding, or at least encode spaces as %20 instead of a + character.

Thanks,

Paul Moen
pmoen at nd.gov<mailto:pmoen at nd.gov>
701-328-2434

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