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Asked: 2026-05-27T04:12:53+00:00

I tried the following code in R on windows: library(RCurl) postForm(https://www.google.com/accounts/ClientLogin/, email = me@gmail.com,

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I tried the following code in R on windows:

library(RCurl)
postForm("https://www.google.com/accounts/ClientLogin/",
    "email" = "me@gmail.com",
    "Passwd" = "abcd",
    "service" = "finance",
    "source" = "Test-1"
)

but go the following error:

Error in postForm()
SL certificate problem, verify that the CA cert is OK. Details:
error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed

How do I setup RCurl to allow use of HTTPs?

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1 Answer

  1. Editorial Team

    You need to install a SSL library.

    1. For windows you can get one here: Download “OpenSSL for Windows” version 0.9.8k

    2. Unzip to a temporary folder, and copy the files “libeay32.dll” and
      “ssleay32.dll” from the “bin” sub-folder to R\library\RCurl\lib\i386.

    3. Also you might copy it into the same directory as the R.exe.

    4. Then check if you have access to the https protocol:

      library(RCurl)
curlVersion()$protocol 
## [1] "tftp"   "ftp"    "telnet" "dict"   "ldap"   "http"   "file"   "https"     
## [9] "ftps"   "scp"    "sftp"

    5. Then install a new set of credential files:

      ca-bundle.crt can be found at : http://curl.haxx.se/ca/cacert.pem

      rename / copy to ca-bundle.crt

    6. Test with this:

      getURL("https://www.google.com/accounts/ClientLogin/?service=finance&email=me@gmail.com&Passwd=abcd&source=Test-1", 
       cainfo = "path to R/library/RCurl/CurlSSL/ca-bundle.crt")
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