javascript - Querying MapServer using WFS functionality

I'm trying to display a shapefile using OpenLayers and Mapserver. Instead of overlaying it as a png, I want to return a vector, in this case a KML file. My HTML file (located in the same folder as mapserv on my server contains the following html/javascript:

The shapefile, MLSOA, is projected using EPSG:27700. My mapfile, is called wfs.map is as follows:

MAP # start of map file

NAME demo
STATUS ON
SIZE 420 300
EXTENT 82299.5 5002.78 655979.76 657599.55
UNITS METERS
SHAPEPATH "shapefiles"

IMAGECOLOR 255 255 255
  PROJECTION
    "init=epsg:27700"
  END

OUTPUTFORMAT
  NAME "kml"
  DRIVER KML
  MIMETYPE "application/vnd.google-earth.kml.xml"
  IMAGEMODE RGB

  EXTENSION "kml"
END

WEB
#TEMPLATE "template.html"
IMAGEPATH "/home/webapps/htdocs/output/"
IMAGEURL "/output/"
  METADATA
    "wfs_title"          "MLSOA"
    "wfs_version"           "1.0.0"

    "wfs_connectiontimeout" "60"
    "wfs_maxfeatures"       "10"
    "wfs_enable_request"   "*"
  END
END

  LAYER
     NAME "MLSOA"
     TYPE POLYGON
     STATUS DEFAULT

     CONNECTION "http://mysite.com/mapserv.cgi/wfs?&map=wfs.map&"
     CONNECTIONTYPE WFS
     CLASS
       STYLE
        COLOR 255 128 128
          OUTLINECOLOR 96 96 96
        END 
       END
     END
END

To check that this works, when I run:

http://mysite.com/mapserv.cgi/wfs?map=/home/urbmet/webapps/htdocs/wfs.map&SERVICE=WFS&REQUEST=GetCapabilities&VERSION=1.0.0

I get the following output.

so I assume that it is working ok. However when I open my HTML file, the post query appears to run ok (as far as I understand):

the_geom

-55.50109375,43.134977942511 55.24109375,59.593781185019

but the response from the server is as follows:

  
msWFSGetFeature(): WFS server error. FLTApplyFilterToLayer() failed
msWFSLayerWhichShapes(): WFS connection error. WFS request produced unexpected output (junk?) for layer MLSOA.
msBuildWFSLayerPostRequest(): WFS connection error. MapServer supports only WFS 1.0.0 or 0.0.14 (please verify the version metadata wfs_version).
msWFSLayerWhichShapes(): WFS connection error. WFS request produced unexpected output (junk?) for layer MLSOA.
msWFSLayerWhichShapes(): WFS connection error. WFS request produced unexpected output (junk?) for layer MLSOA.

msBuildWFSLayerPostRequest(): WFS connection error. MapServer supports only WFS 1.0.0 or 0.0.14 (please verify the version metadata wfs_version).
  

I'm not sure what to do to fix this error message. I've checked that Openlayers is sending a query with version: "1.0.0" encoded, but the other errors are not as clear. What can I do to fix this?

Answer

Your MAP file seems to indicate that your LAYER is coming from another WFS server using CONNECTIONTYPE WFS - are you sure you mean to do this?

If you just want to enable WFS for a layer using data on your server then just define a standard LAYER.

 LAYER
    NAME 'MLSOA'

    TYPE POLYGON
    DATA "C:/path/shapefile.shp"
    CLASS
      STYLE
       COLOR 255 128 128
       OUTLINECOLOR 96 96 96
      END 
    END
END

You'll need to request your WFS using the srsName of the OpenLayers map (EPSG:900913 by default - plus you will have to add this projection definition to your MAP file). Also use version 1.1.0 and add an srsName to your query string. Details and notes (of a not particularly pleasant process!) at:

http://geographika.co.uk/mapserver-openlayers-and-the-wfs-maze