R help - Oct 2022 - R version 4.2.1 install.packages does not work with IE proxy setting

Dear all

After we installed new R version R 4.2.1 installing packages through IE
proxy setting is compromised with warning that R could not connect to server
(tested in vanilla R).
> chooseCRANmirror()
Warning: failed to download mirrors file (cannot open URL
'https://cran.r-project.org/CRAN_mirrors.csv'); using local file
'D:/programy/R/doc/CRAN_mirrors.csv'
Warning message:
In download.file(url, destfile = f, quiet = TRUE) :
  URL 'https://cran.r-project.org/CRAN_mirrors.csv': status was
'Couldn't
connect to server'

So install.packages("whatever") also ends with similar warnings.

When using directly (without proxy need) install.packages works as expected.

In R4.1.0 version it works as expected, without any warnings and packages
could be installed smoothly.

Is it known issue with this version? 
Could it be due to somehow corrupted installation?
Should we set something differently for this new R version

Best regards
Petr

On Tue, 4 Oct 2022 11:01:14 +0000
PIKAL Petr <petr.pikal at precheza.cz> wrote:
> After we installed new R version R 4.2.1 installing packages through
> IE proxy setting is compromised with warning that R could not connect
> to server (tested in vanilla R).
R 4.1 deprecated the use of download.file(method = 'wininet'). R 4.2
switched the default download method to 'libcurl' and started giving
warnings for 'wininet' and http[s]:// URLs.

A workaround to get it working right now would be to set
options(download.file.method = 'wininet') and live with the resulting
warnings while R downloads the files, but a next version of R may
remove 'wininet' support altogether.

In order to get it working with the 'libcurl' method, you'll need to
provide some environment variables to curl:
https://stat.ethz.ch/pipermail/r-help/2022-September/475917.html

Not sure if libcurl would accept a patch to discover the Windows proxy
settings automatically, but I don't think it does that now.

-- 
Best regards,
Ivan