cygwin wget over corprate proxy

liqy@testserver1 /bin
$ export http_proxy="http://domain1\liqy:password1@proxy1:8080/"

$ echo $http_proxy
http://domain1\liqy:password1@proxy1:8080/

liqy@testserver1 /bin
$ wget http://apt-cyg.googlecode.com/svn/trunk/apt-cyg
--2014-08-26 11:10:43--  http://apt-cyg.googlecode.com/svn/trunk/apt-cyg
Resolving proxy1 (proxy1)... 10.33.90.91
Connecting to proxy1 (proxy1)|10.33.90.91|:8080... connected.
Proxy request sent, awaiting response... 200 OK
Length: 10572 (10K) [text/plain]
Saving to: ‘apt-cyg.1’

100%[======================================>] 10,572      --.-K/s   in 0.001s

2014-08-26 11:10:43 (17.6 MB/s) - ‘apt-cyg.1’ saved [10572/10572]