WMS-WFS chaining (bug?)

[Eijnden, Bart van den (AGI)]

Barend,

I checked the source code briefly (mapwfslayer.c), and there is the following note:

 * Revision 1.34  2005/04/22 15:47:10  assefa
 * Bug 1302: the wfs/ows_service parameter is not used any more. The
 * service is always set to WFS for WFS layers. 

So it's time to upgrade indeed ....

Alternatively you could have used (so you do not need to add service=WFS to your CONNECTION which indeed is not recommended at all):

LAYER
  ..
  METADATA
    ..
    wfs_service "WFS"
    ..
  END
END

Best regards,
Bart

-----Oorspronkelijk bericht-----
Van: UMN MapServer Users List
[mailto:MAPSERVER-USERS at LISTS.UMN.EDU]Namens Barend Köbben
Verzonden: dinsdag 27 juni 2006 17:13
Aan: MAPSERVER-USERS at LISTS.UMN.EDU
Onderwerp: [UMN_MAPSERVER-USERS] WMS-WFS chaining (bug?)


Hi,

I found a strange / undocumented feature when trying to chain a Mapserver WMS service with a MapServer WFS. Both are using 4.2.2.

In the WMS map configuration, I defined the layer that was to come from the WFS as follows (following the HowTo on the website):
...
LAYER
     NAME airports
     TYPE POINT
     STATUS ON
     CONNECTIONTYPE WFS
     CONNECTION "http://geoserver.itc.nl/cgi-bin/mapserv.exe?map=D:/Inetpub/geoserver/kobben/thailand/wfs_config.map&"
     METADATA
  	"wfs_typename"          	"airportsWFS"
	"wfs_version"          	 "1.0.0"
	"wfs_request_method"    "GET"
	"wfs_connectiontimeout" "60"
    	"wfs_maxfeatures"       "100"
     END
...


But this yielded an error message that went:

<?xml version='1.0' encoding="ISO-8859-1" standalone="no" ?>
<!DOCTYPE ServiceExceptionReport SYSTEM "http://schemas.opengeospatial.net/wms/1.1.1/exception_1_1_1.dtd">
<ServiceExceptionReport version="1.1.1">
<ServiceException>
msBuildWFSLayerGetURL(): WFS connection error. Metadata wfs_service must be set in the layare
</ServiceException>
</ServiceExceptionReport>


Cryptic message, and it took me a looooong time to find that it DID work when I added SERVICE=WFS to the CONNECTION string, although the HowTo states that adding such things there is deprecated...

...
     CONNECTION "http://geoserver.itc.nl/cgi-bin/mapserv.exe?map=D:/Inetpub/geoserver/kobben/thailand/wfs_config.map&&SERVICE=WFS&"
...

You can try it out yourself at http://geoserver.itc.nl/cgi-bin/mapserv.exe?map=D:/Inetpub/geoserver/kobben/thailand/chain_config.map&&VERSION=1.1.1&REQUEST=GetMap&LAYERS=world,airports&SRS=EPSG:4326&BBOX=97,5,106,21&WIDTH=600&HEIGHT=800&FORMAT=image/png

Is this a bug, or does it mean it's time to upgrade my Mapserver, or....?

--
Barend Köbben
International Institute for Geo-information 
Sciences and Earth Observation (ITC) 
PO Box 6, 7500AA Enschede (The Netherlands)
ph: +31 (0)53 4874253; fax: +31 (0)53 4874335
 


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