[BioC] Proxy setting for R/Bioconductor

[Karthik]

Hello,

I am working behind an institutional proxy and can not get past it. How should I
enable proxy in R. I tried:

 "path_to_R\bin\i386\Rgui.exe" http_proxy=http://gannet/ http_proxy_user=ask

and gave user name and password, but when I tried to run:

source("http://bioconductor.org/biocLite.R")

it gave :

Error in file(filename, "r", encoding = encoding) : 
  cannot open the connection
In addition: Warning message:
In file(filename, "r", encoding = encoding) :
  cannot open: HTTP status was '404 Not Found'

how to go about this issue??

Thanks a lot.

Karthu