install cygwin x86 version with --site parameter

[Lynn]

hi ,
  we are using cygwin command line to install cygwin on x86 win7 machine  ,there is one parameter we are using --site


$setup-x86.exe --site "http://username:password@{ip address}  


is this supported (username:password)?   per our observation ,it can't resolve "username"




thanks
Lynn