WMS Connector does not return error message when unsupported SRS is requested

Description

When sending a WMS request, ArcIMS will return an error message if the Spatial Reference System code (SRS) is not recognized. At ArcIMS 9.1 Service Pack 1 the error message is "Invalid SRS Value."

This sample Capabilities File fragment and the following GetMap request may cause such a problem.

Capabilities File fragment:

Code:
...
<Layer queryable="0" opaque="0" noSubsets="0">
    <Name>wmstest</Name>
    <Title>wmstest</Title>
    <SRS>EPSG:4326</SRS>
    <SRS>EPSG:4327</SRS>
<LatLonBoundingBox minx="-180" miny="-90" maxx="180" maxy="90"/>
...

Code:
http://myserver/wmsconnector/com.esri.wms.Esrimap/wmsservice
?service=WMS
&request=GetMap
&Layers=wmstest
&Styles=
&Version=1.1.1
&SRS=EPSG:4328
&BBOX=-180,180,-90,90
&width=400
&height=300&

Note:
EPSG:4328 is not listed in capabilities file, therefore an error exception will be returned:

Code:
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<ServiceExceptionReport version="1.1.1">
<ServiceException code="InvalidSRS">
Invalid SRS value
</ServiceException>
</ServiceExceptionReport>

Cause

In WMS, a Spatial Reference System (SRS) is a text parameter that specifies a horizontal coordinate reference system code. When a WMS GetMap request is issued with an SRS value not listed in the WMS Capabilities file, the WMS Connector returns an exception stating it has encountered an invalid SRS.

Workaround