[Axis2] Proxy Authentication

[Sean Cote]

I get the following exception whenever I try to connect to my web-service via a 
proxy server:

[INFO] HTTPSender - Unable to sendViaPost to url[http://mywebservice]
<org.apache.axis2.AxisFault: Transport error: 407 Error: Proxy Authentication 
Required>org.apache.axis2.AxisFault: Transport error: 407 Error: Proxy 
Authentication Required
            at 
org.apache.axis2.transport.http.HTTPSender.handleResponse(HTTPSender.java:296)
            at 
org.apache.axis2.transport.http.HTTPSender.sendViaPost(HTTPSender.java:190)
            at 
org.apache.axis2.transport.http.HTTPSender.send(HTTPSender.java:75)
            at 
org.apache.axis2.transport.http.CommonsHTTPTransportSender.writeMessageWithCommons(CommonsHTTPTransportSender.java:371)
            at 
org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTTPTransportSender.java:209)
            at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:448)
            at 
org.apache.axis2.description.OutInAxisOperationClient.send(OutInAxisOperation.java:401)
            at 
org.apache.axis2.description.OutInAxisOperationClient.executeImpl(OutInAxisOperation.java:228)
            at 
org.apache.axis2.client.OperationClient.execute(OperationClient.java:163)

I am using Axis2-1.4 with Java6u7. I just switched my client application from 
using Axis1 to Axis2. With Axis1, I was just using the system properties 
(http.proxyHost, http.proxyPort, http.proxyUser, and http.proxyPassword), but 
they don't seem to work anymore. So, I tried using ProxyProperties, like this, 
but to no avail:

final HttpTransportProperties.ProxyProperties pp = new 
HttpTransportProperties.ProxyProperties();
pp.setProxyName(System.getProperty("http.proxyHost"));
pp.setProxyPort(Integer.parseInt(System.getProperty("http.proxyPort")));
pp.setUserName(System.getProperty("http.proxyUser"));
pp.setPassWord(System.getProperty("http.proxyPassword"));
options.setProperty(HTTPConstants.PROXY, pp);

I do have it working with a non-authenticating proxy server. I got it to work 
with Axis2 by adding this line:

options.setProperty(HTTPConstants.HTTP_PROTOCOL_VERSION, 
HTTPConstants.HEADER_PROTOCOL_10);

What is it that I don't understand about connecting to a web-service through an 
authenticating proxy server in Axis2?

Thanks!
Sean