Test curl proxy conf

test.md

Test IE proxy settings with curl

The goal is to correctly test the various possible proxy configurations under windows and use those settings in the curl package.

Install the latest version of the curl package:

install.packages("curl")
stopifnot(packageVersion("curl") >= "0.9.2")

The ie_proxy_info function looks up your current proxy settings as configured in IE under Internet Options > Tab: Connections > LAN Settings.

ie_proxy_info()

Confirm that the settings correspond to your settings in IE.

Lookup proxy for a given URL

The ie_get_proxy_for_url function determines if and which proxy should be used to connect to a particular URL. If your settings have an "automatic configuration script" this involves downloading and executing a PAC file, which can take a while.

ie_get_proxy_for_url("http://www.google.com/test")
ie_get_proxy_for_url("http://localhost/test")
ie_get_proxy_for_url("http://foo/test")

The ie_get_proxy_for_url function either returns a URL of a proxy, or NULL if no proxy should be used for this target host.

Try connecting

Test if you can connect to various servers that you are able to connect to with internet explorer.

connect_with_proxy <- function(url){
  proxy_server <- ie_get_proxy_for_url(url)
  h <- new_handle(verbose = TRUE, proxy = proxy_server)
  readLines(curl(url, handle = h))
}

connect_with_proxy("http://httpbin.org/get")

For completeness, you should include a library(curl) call after installation.

All good at my end. Using auto config URL, no auto-detect. 👍