svn behind proxy

Need to edit the servers file located at your HOME DIRECTORY under .subversion directory
then need to set up you proxy host and proxy port

vi ~/.subversion/servers

add or uncomment the properties having
http-proxy-host , http-proxy-port 

eg.

If you are using Squid

http-proxy-host = xxx.xxx.xxx.xxx
http-proxy-port = 3128

check for configuration options for enabeling svn behind squid