How to disable chunked-encoding in a JBossWS client

Issue

• How can we disable chunked encoding in JBossWS?
• There appears to be no way of controlling the chunked setting when web services are called via SAAJ.
• I get an HTTP 500 error from an IIS server using a JBossWS native client, but I don't get an error when using a Sun Metro client or SoapUI.
• Web service invocation giving:

org.jboss.remoting.CannotConnectException: Can not connect http client invoker. Invalid HTTP server response [411] - Length Required.
Response: Length Required/411.  
    at org.jboss.remoting.transport.http.HTTPClientInvoker.useHttpURLConnection(HTTPClientInvoker.java:348)

• Web service invocation giving errors:

Caused by: org.jboss.ws.WSException: Invalid HTTP server response [404] - Not Found
    at org.jboss.ws.core.soap.SOAPMessageUnMarshallerHTTP.read(SOAPMessageUnMarshallerHTTP.java:75)
    at org.jboss.remoting.transport.http.HTTPClientInvoker.readResponse(HTTPClientInvoker.java:608)
    at org.jboss.remoting.transport.http.HTTPClientInvoker.useHttpURLConnection(HTTPClientInvoker.java:402)