<rule name="Convert to lower case" enabled="true" stopProcessing="true">
                    <match url="[A-Z]" ignoreCase="false" />
                    <conditions logicalGrouping="MatchAll" trackAllCaptures="false">
                        <add input="{URL}" pattern="\.asmx" negate="true" />
                        <add input="{URL}" pattern="\.svc" negate="true" />
                        <add input="{URL}" pattern="\.ashx" negate="true" />
                        <add input="{URL}" pattern="\.js" negate="true" />
                    </conditions>
                    <action type="Redirect" url="{ToLower:{URL}}" appendQueryString="false" />
                </rule>