New answers tagged geoext
For the specific case of GeoServer you can also add the propertyName vendor option to the request and enumerate the attributes you want to include in the response: http://docs.geoserver.org/latest/en/user/services/wms/vendor.html#propertyname
If you have control over the geoserver and you use the html format, you could modify the template server side. Otherwise I can think of retrieving the FeatureInfo as GML2 or text and modify if client-side. But I don't know how this might be implemented in openlayers.
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