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So far, I have only observed issues with WFS requests.
Omitting the “service=wfs” parameter from a KVP-encoded request generally works just fine, as long as you are using the applicable virtual service endpoint. However, sometimes it doesn’t. All testing is done with a GeoServer 2.10.2 installation with no extensions:
With service=wfs:
http://localhost:8080/geoserver/wfs?service=wfs&request=GetFeature&typenames=sf:roads&version=2.0.0
returns all property values for all features in sf:roads
http://localhost:8080/geoserver/wfs?service=wfs&request=GetFeature&typenames=sf:roads&version=2.0.0&propertyname=
returns all property values for all features in sf:roads
http://localhost:8080/geoserver/wfs?service=wfs&request=GetFeature&typenames=sf:roads&version=2.0.0&propertyname=*
returns all property values for all features in sf:roads
http://localhost:8080/geoserver/wfs?service=wfs&request=GetFeature&typenames=sf:roads&version=2.0.0&propertyname=cat
returns all values for cat property for all features in sf:roads
http://localhost:8080/geoserver/wfs?service=wfs&request=GetFeature&typenames=sf:roads&version=2.0.0&propertyname=cat,label
returns all values for cat and label properties for all features in sf:roads
Without service=wfs:
http://localhost:8080/geoserver/wfs?request=GetFeature&typenames=sf:roads&version=2.0.0
returns all property values for all features in sf:roads
http://localhost:8080/geoserver/wfs?request=GetFeature&typenames=sf:roads&version=2.0.0&propertyname=
<ows:Exception exceptionCode="NoApplicableCode">
<ows:ExceptionText>java.lang.NullPointerException</ows:ExceptionText>
</ows:Exception>
http://localhost:8080/geoserver/wfs?request=GetFeature&typenames=sf:roads&version=2.0.0&propertyname=*
<ows:Exception exceptionCode="NoApplicableCode">
<ows:ExceptionText>java.lang.NullPointerException</ows:ExceptionText>
</ows:Exception>
http://localhost:8080/geoserver/wfs?request=GetFeature&typenames=sf:roads&version=2.0.0&propertyname=cat
<ows:Exception exceptionCode="NoApplicableCode">
<ows:ExceptionText>
java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Collection java.lang.String cannot be cast to java.util.Collection
</ows:ExceptionText>
</ows:Exception>
http://localhost:8080/geoserver/wfs?request=GetFeature&typenames=sf:roads&version=2.0.0&propertyname=cat,label
<ows:Exception exceptionCode="NoApplicableCode">
<ows:ExceptionText>
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 Index: 0, Size: 0
</ows:ExceptionText>
</ows:Exception>
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