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我在使用http代理并希望使用sudo port selfupdate更新macports。但它总是失败，出现以下的输出：尽管RSYNC_PROXY已设置，但rsync代理无法正常工作
$ sudo port -d selfupdate
DEBUG: Copying /Users/simon/Library/Preferences/com.apple.dt.Xcode.plist to /opt/local/var/macports/home/Library/Preferences
DEBUG: MacPorts sources location: /opt/local/var/macports/sources/rsync.macports.org/release/tarballs
---> Updating MacPorts base sources using rsync
rsync: getaddrinfo: rsync.macports.org 873: nodename nor servname provided, or not known
rsync error: error in socket IO (code 10) at /SourceCache/rsync/rsync-42/rsync/clientserver.c(105) [receiver=2.6.9]
Command failed: /usr/bin/rsync -rtzv --delete-after rsync://rsync.macports.org/release/tarballs/base.tar /opt/local/var/macports/sources/rsync.macports.org/release/tarballs
Exit code: 10
DEBUG: Error synchronizing MacPorts sources: command execution failed
while executing
"macports::selfupdate [array get global_options] base_updated"
Error: /opt/local/bin/port: port selfupdate failed: Error synchronizing MacPorts sources: command execution failed
显然的问题是，rsync没有连接到服务器，所以我试过单独和rsync它给了我一个类似的结果。
$ sudo /usr/bin/rsync -rtzvvv --delete-after rsync://rsync.macports.org/release/tarballs/base.tar /opt/local/var/macports/sources/rsync.macports.org/release/tarballs
opening tcp connection to rsync.macports.org port 873
rsync: getaddrinfo: rsync.macports.org 873: nodename nor servname provided, or not known
rsync error: error in socket IO (code 10) at /SourceCache/rsync/rsync-42/rsync/clientserver.c(105) [receiver=2.6.9]
_exit_cleanup(code=10, file=/SourceCache/rsync/rsync-42/rsync/clientserver.c, line=105): about to call exit(10)
我得到我的RSYNC_PROXY环境变量设置和代理工作，但根据rsync输出好像它不使用我给它的代理，但试图直接连接来代替。谁能帮忙？谢谢！
这里有一些需要的情况下的更多信息。
$ echo $RSYNC_PROXY
127.0.0.1:3128
$ curl -x localhost:3128 http://rsync.macports.org:873/
@RSYNCD: 30.0
$ uname -a
Darwin Simon-MP.local 12.0.0 Darwin Kernel Version 12.0.0: Sun Jun 24 23:00:16 PDT 2012; root:xnu-2050.7.9~1/RELEASE_X86_64 x86_64