GeoServer WMS GetFeatureInfo – Troubleshooting Empty Responses

geoservergetfeatureinfoopenlayers-2wms

I'm having trouble with a select feature example in GeoServer and OpenLayers. For some reason the request returns nothing.

Here's the stripped down version that produces this:

I have a small WMS layer(~100 parcels) with polygons, and address data that I am overlaying Google Maps with a projection. It displays correctly. 

map = map(...); //standard map creation
gmap = ...; // standard street map creation
wmslayer = new OpenLayers.Layer.WMS(
            "Parcels",
            "http://192.168.0.205/geoserver/wms", 
            {'layers': 'test:parcel', 'format':'image/png', 'transparent':'true'},
            {'opacity': 0.5, 'isBaseLayer': false, 'visibility' : false, 'zoomMin' : 15}
);

Then I create the click control…

infoControls = 
           {
            click: new OpenLayers.Control.WMSGetFeatureInfo
            ({
                url: 'http://192.168.0.205/geoserver/wms', 
                title: 'Get parcel data',
                layers: [wmslayer],
                queryVisible: true
            })
        };

Added the layers, add the control and activate it

map.addLayers([gmap, wmslayer]);  
infoControls[0].events.register("getfeatureinfo", this, showInfo);
map.addControl(infoControls[0]);
infoControls.click.activate();

//show info callback
function showInfo(evt) {    
    console.log(evt);
    alert(evt.text);
}

But when I click on the map inside I parcel, it gives the alert is blank, and so is the features in Firebug (from console.log(evt)).

The GET request in Firebug is red.

BBOX    -10845148.716676,5165071.048543,-10843335.725912,5166002.624825
FEATURE_COUNT   10
FORMAT  image/png
HEIGHT  390
INFO_FORMAT text/html
LAYERS  test:parcel
QUERY_LAYERS    test:parcel
REQUEST GetFeatureInfo
SERVICE WMS
SRS EPSG:900913
STYLES  
VERSION 1.1.1
WIDTH   759
X   582
Y   246

Edit: The database is CRS is EPSG:4327 and projecting it to Google Mercator… Do I need to project the BBOX of the request back to EPSG:4327 before I send the WMS request? How can I do this?

Here is the GeoServer log of the request

2011-07-22 14:49:01,301 INFO [geoserver.wms] - 
Request: getFeatureInfo
    GetMapRequest = 
GetMap Request
 version: 1.1.1
 output format: image/png
 width height: 759,390
 bbox: ReferencedEnvelope[-1.0845637448332E7 : -1.0842011466804E7, 5164278.964868 : 5166142.117432]
 layers: test:parcel
 styles: polygon
    QueryLayers = [org.geoserver.wms.MapLayerInfo@a837896f]
    XPixel = 385
    YPixel = 144
    FeatureCount = 10
    InfoFormat = text/html
    Exceptions = application/vnd.ogc.se_xml
    Version = 1.1.1
    Request = GetFeatureInfo
    BaseUrl = http://192.168.0.205:8080/geoserver/
    Get = false
    RawKvp = {INFO_FORMAT=text/html, BBOX=-10845637.448332,5164278.964868,-10842011.466804,5166142.117432, QUERY_LAYERS=test:parcel, SERVICE=WMS, HEIGHT=390, REQUEST=GetFeatureInfo, STYLES=, WIDTH=759, FEATURE_COUNT=10, VERSION=1.1.1, FORMAT=image/png, LAYERS=test:parcel, Y=144, X=385, SRS=EPSG:900913}
    RequestCharset = null

Best Answer

So mostly for future readers of this question - when you are doing getFeatureInfo requests to a different server (which includes a difference in the port number) you need a proxy - see http://trac.osgeo.org/openlayers/wiki/FrequentlyAskedQuestions#ProxyHost for more discussion.

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