Using the get task with http authentication causes ArrayIndexOutOfBoundsException.

Running the following build file results in the error :
java.lang.ArrayIndexOutOfBoundsException: 24

<project name="ant bug" default="bug">

    <property name="tc.manager.user"     value="eefiegel" />
    <property name="tc.manager.password" value="eefiegel" />
    <property name="tc.manager.url"      value="http://eek:8096/manager/html" />

    <property name="file.out" value="${basedir}/list.out" />

    <target name="bug" 
     description="demonstrate ant 1.6.3 bug with the get task">
        <get username="${tc.manager.user}"
             password="${tc.manager.password}"
                  src="${tc.manager.url}/list"
                 dest="${file.out}" />
    </target>
</project>