[R] HTTP User-Agent header

Prof Brian Ripley ripley at stats.ox.ac.uk
Fri Jul 28 16:43:34 CEST 2006

What OS is this?

If Windows, see the rw-FAQ Q2.19.

Otherwise, see ?download.file and choose a different download method,
or look at the source code (src/modules/internet/nanohttp.c) and submit a 

On Fri, 28 Jul 2006, James P. Howard, II wrote:

> I am using R in an environment where the HTTP proxy server blocks
> browsers that do not send User-Agent strings.  

Given how incredibly easy they are to fake, why?

> Through some testing, we have determined that R, by default (2.3.1) does 
> not send a string when performing the chooseCRANmirror() function.  Is 
> there a setting

BTW, the chooseCRANmirror() function does not do HTTP: download.file() and 
url() do and the help is at ?download.file.

> that allows us to manually set the User-Agent value?
> Thank you, James

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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