[Qgis-user] No GetFeatureInfo request sent in QGIS Desktop on WMS layer

[Jeff McKenna]

Hi Andreas,

(so great to see the QGIS + MapServer communities working together here)

Inspired by your questions today, I gave another round of updates to the 
MapServer documentation, improving the examples for GetFeatureInfo etc.

Besides what was mentioned already, you might also consider setting the 
"gml_" metadata parameters for your layer, to send the geometry as part 
of the "Feature" response (in the Identify Results / GetFeatureInfo 
window of QGIS, select "Feature" in the dropdown box) [note that often 
that Feature dropdown is blank in that QGIS window until I first chose 
either "text" or "html" and reselect "Feature" to get the GML format 
request through GetFeatureInfo sent back to QGIS].  Here are those 
parameters:

MAP
  ...
    WEB
      ...
      METADATA
        "wms_title"          "WMS Demo Server"  ##required
        "wms_abstract"       "Longer description of your service" 
##recommended
         "wms_onlineresource" 
"http://yourpath/cgi-bin/mapserv.exe?map=/path/to/your-mapfile.map" 
##required (must change mapfile path)
         "wms_srs"            "EPSG:3978 EPSG:3857 EPSG:4269 EPSG:4326" 
  ##recommended
         "wms_enable_request" "*"   ##required
         "wms_getfeatureinfo_formatlist" 
"text/plain,text/html,application/vnd.ogc.gml,gml" ##recommended
     END #metadata
   END #web
   ...
   LAYER
     ...
     METADATA
       "wms_title"         "Parks"   ##required
       "wms_abstract"      "Longer description of your layer" ##recommended
       "wms_include_items" "all" ##optional
       "gml_include_items" "all" ##optional
       "gml_featureid"     "ogc_fid" ##optional
       "gml_geometries"    "msgeom" ##optional
       "gml_msgeom_type"   "multipolygon" ##optional
     END #metadata
     ...
     TEMPLATE "empty" ##recommended (enable GetFeatureInfo / can point 
to valid .html template)
     ...
   END #layer
END #map

Or see the example WMS Server mapfile at: 
https://mapserver.org/ogc/wms_server.html#sample-wms-server-mapfile

Again, it's excellent to see the QGIS & MapServer communities working 
together, thanks for this! :)

PS. I bet I've listed QGIS there on that WMS Server document page for 
now 20 years, as the recommended desktop client for testing, ha.

-jeff





-- 
Jeff McKenna
GatewayGeo: Developers of MS4W, MapServer Consulting and Training
co-founder of FOSS4G
http://gatewaygeo.com/



On 2022-05-20 4:41 a.m., Andreas Neumann via Qgis-user wrote:
> Hi Barend,
> 
> Thanks. It's been a while since I last worked with UMN map server.
> 
> I must have been "blind" not to see the queryable="0" in the 
> Capabilities response.
> 
> Your suggestions helped. All fine now!
> 
> Thanks a lot,
> 
> ANdreas
> 
> On 2022-05-20 09:18, Kobben, Barend (UT-ITC) wrote:
> 
>> Your mMAP set up apparently is wrong, because contrary to what you 
>> think, the layer is NOT queryable:
>>
>> <Layer queryable="0" opaque="0" cascaded="0">
>>
>> <Name>cave_entrances</Name>
>>
>> Usualy this means you have to set appropriate things in the .map file, 
>> such as
>>
>> First, we have to prepare MapServer to actually be set up to respond 
>> to the request in a way the OpenLayers script can handle:
>>
>> Edit your .map file. In *each* LAYER object you want to query, put the 
>> lines:
>>
>>     TOLERANCE 5
>>
>>     TOLERANCEUNITS pixels
>>
>> In each LAYER object's METADATA put the extra line:
>>
>>     "wms_include_items" "all"
>>
>> In each CLASS object put the extra line:
>>
>>     TEMPLATE "empty"
>>
>> /-- /
>>
>> /Barend Köbben/
>>
>> On 20/05/2022, 09:10, "Qgis-user on behalf of Andreas Neumann via 
>> Qgis-user" <qgis-user-bounces at lists.osgeo.org 
>> <mailto:qgis-user-bounces at lists.osgeo.org> on behalf of 
>> qgis-user at lists.osgeo.org <mailto:qgis-user at lists.osgeo.org>> wrote:
>>
>> Hi,
>>
>> I am experimenting with a very simple/basic WMS served by UMN Mapserver.
>>
>> For some reasons, GetFeatureInfo does not work, although it is 
>> "advertised" as available in the GetCapabilities reponse.
>>
>> Here is the test service: 
>> http://159.100.248.156/cgi-bin/mapserv.fcgi?map=/home/ubuntu/umn_mapfiles/cave_entrances.map 
>> <http://159.100.248.156/cgi-bin/mapserv.fcgi?map=/home/ubuntu/umn_mapfiles/cave_entrances.map>
>>
>> and a link to the GetCapabilities request
>>
>> http://159.100.248.156/cgi-bin/mapserv.fcgi?map=/home/ubuntu/umn_mapfiles/cave_entrances.map&SERVICE=WMS&REQUEST=GetCapabilities 
>> <http://159.100.248.156/cgi-bin/mapserv.fcgi?map=/home/ubuntu/umn_mapfiles/cave_entrances.map&SERVICE=WMS&REQUEST=GetCapabilities>
>>
>> When I load this layer, i get the two points in the data set, but I 
>> can't query them. QGIS says "No feature found at this position" and in 
>> the network debugging session I see that no request is sent to the server.
>>
>> Do you have any idea what might be wrong with this WMS service?
>>
>> Thank you and greetings,
>>
>> Andreas
>>
>