[R] http proxies: setting and unsetting

Gabor Grothendieck ggrothendieck at gmail.com
Wed May 30 04:49:26 CEST 2007

Note that Windows XP has 4 types of environment variables and I suspect
that the problem stems from not taking that into account:


On 5/29/07, matt.pettis at thomson.com <matt.pettis at thomson.com> wrote:
> Hi,
> I am trying to use R at work and at home on the same computer.  At work, I have a proxy, and at home, I do not.  I have, for work, a User environment variable "http_proxy" which I set in the OS (Windows XP Pro).  When I am at work, and I try to retrieve data from the web with 'read.csv', things work just fine.  I assume it knows how to use the proxy.
> The trouble is when I am at home and have no proxy, R still tries to use my work proxy.  I have tried the following:
> Sys.setenv("http_proxy"="")
> Sys.setenv("no_proxy"=TRUE)
> Sys.setenv("no_proxy"=1)
> none of which seems to work.  Whenever I try to use read.csv, it tells me that it cannot find my work proxy, which I am trying to tell R to ignore.
> I can solve this problem by removing the http_proxy environment variable binding in the OS when at home, but that is a pain, because then I have to reset it when I go back into work.
> Is there a way to tell R within a session to ignore the proxy?  If so, what am I doing wrong?
> thanks,
> matt
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