How to make my URLConnection through proxy(need authentication)

Hi...
we are writing a net program behind the firewall,and the proxy server need authentication(you have to input your id,pswd and the domain where you are), so, our URLConnection cant reach the outside of the firewall.
Is there any solution???

For HTTP:
Check for example http://forum.java.sun.com/thread.jsp?forum=31&thread=360245

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Java version: 1.6.0_27
OpenJDK Runtime Environment (IcedTea6 1.12.4) (6b27-1.12.4-1ubuntu1)
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Edited by: 1002346 on 2013/4/29 上午 12:05

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I have problems with my applet working through
gh proxy.I am using a client applet which makes a
socket connection to a Java application running on the
same pc as the web server.
Everything works fine when I am directly
ly connected.However it does't work when connected
through a proxy? I am using object o/p & i/p streams
for the exchange of data b/w client applet & the
server java application.How do I overcome this
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Currently I am using WinGate 3.0.2 as my proxy(I
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How to make my URLConnection through proxy(need authentication)

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