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I’m currently getting the following error on a Windows machine:

> devtools::install_github("hadley/readr")
Error in curl::curl_fetch_disk(url, x\$path, handle = handle) :
Peer certificate cannot be authenticated with given CA certificates


The machine in question is sitting behind a gnarly firewall and proxy, which I suspect are the source of the problem. I also need to use --ignore-certificate-errors when running chromium-browser, which points to the same issue.

This seems to resolve the issue:

> library(httr)
> set_config(config(ssl_verifypeer = 0L))


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