client program doesn't get exception for a http 500 staus response

I'm working with axis2 1.5.1, and try to use it as webservice client.
when I try to invoke a oneway webservice operation, I found if the server
return http 500, I didn't got any exception in client side.
but for other status code, like, http 404, I can get an exception.
I made some study on axis2 source code.
and found the logic in following method,
org.apache.axis2.transport.http.HTTPSender.handleResponse(MessageContext,
HttpMethodBase):

for  HttpStatus.SC_INTERNAL_SERVER_ERROR || HttpStatus.SC_BAD_REQUE
if the operation is 2 way operation, set ProcessingFault to true for income
message.
but for one way operation, there is no special action, except just try to
process the response.
since 1 way operation doesn't expected a response soap message, the
response seems was discarded.
I want to know is there any special consideration for such behavior?
should't a exception be thrown out when response status code is 500 and
operation is of  one way?
I inline the method I mentioned for convenient review.
in addition, I checked source of axis2 1.6, and found the behavior is as
the same.



     * Used to handle the HTTP Response
     *
     * @param msgContext - The MessageContext of the message
     * @param method     - The HTTP method used
     * @throws IOException - Thrown in case an exception occurs
     */
    private void handleResponse(MessageContext msgContext,
                                HttpMethodBase method) throws IOException {
        int statusCode = method.getStatusCode();
        log.trace("Handling response - " + statusCode);
        if (statusCode == HttpStatus.SC_OK) {
            processResponse(method, msgContext);
        } else if (statusCode == HttpStatus.SC_ACCEPTED) {
        } else if (statusCode == HttpStatus.SC_INTERNAL_SERVER_ERROR ||
                statusCode == HttpStatus.SC_BAD_REQUEST) {
            Header contenttypeHeader =

method.getResponseHeader(HTTPConstants.HEADER_CONTENT_TYPE);
            String value = null;
            if (contenttypeHeader != null) {
                value = contenttypeHeader.getValue();
            }
             OperationContext opContext = msgContext.getOperationContext();
            if(opContext!=null){
                MessageContext inMessageContext =

opContext.getMessageContext(WSDLConstants.MESSAGE_LABEL_IN_VALUE);
                if(inMessageContext!=null){
                    inMessageContext.setProcessingFault(true);
                }
            }
            if (value != null) {

                processResponse(method, msgContext);
            }
            //should't a exception be thrown out here in a else branch like
            //else{
                    // throw new
AxisFault(Messages.getMessage("transportError", String.valueOf(statusCode),
 method.getStatusText()));
            //}



            Object isTransportNonBlocking = msgContext.getProperty(
                    MessageContext.TRANSPORT_NON_BLOCKING);
            if (isTransportNonBlocking != null &&
(Boolean)isTransportNonBlocking) {
                throw new AxisFault(Messages.getMessage("transportError",
                        String.valueOf(statusCode),
                        method.getStatusText()));
            }
        } else {
            throw new AxisFault(Messages.getMessage("transportError",

String.valueOf(statusCode),

method.getStatusText()));
        }
    }
thanks
ysliu