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FTP behind proxy

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I am writing a simple ftp client program to download a file from a ftp site. The site requires login and the ftp client is behind a proxy.
I did find some sample show you how to do FTP. Also, some show you how to work with proxy. But not both.
the following is the codes I use. I got IOException "HTTP response code: 401" if the urlString contains userinfo (ftp://user assword@ftp.site/file)
But "ftp://ftp.site/file" works fine.
I think the problem is the communication between the java program and the proxy server. Could anyone help me?

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