[R] proxy settings

Prof Brian Ripley ripley at stats.ox.ac.uk
Wed Apr 18 13:13:28 CEST 2007

On Tue, 17 Apr 2007, Antonio Olinto wrote:

> Hi all,
> I used to connect internet via a proxy. Before update packages I wrote in R
> Sys.putenv("http_proxy"="http://proxy3.redegov.sp.gov.br:80/")
> Nevertheless the way the connection is done has changed. For example, in the
> browser the proxy is not indicated and I have to give an username and a
> password to have access to internet.

This is nothing to do with a browser: see below.

> I read the FAQ and the help for download.file but I was not able to do updates.
> I tried
> Sys.putenv("http_proxy_user"="ask")
> Sys.putenv("http_proxy_user"="http://****:****")

It does say

Setting Proxies:

      This applies to the internal code only.
      These environment variables must be set before the download code
      is first used: they cannot be altered later by calling

You can debug the download.file() session via option() 'internet.info', 
which should show you what is happening.

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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