title: using Rcurl with HTTPs
body: <p>I tried the following code in R on windows:</p>
  
  <pre><code>library(RCurl)
  postForm("https://www.google.com/accounts/ClientLogin/",
      "email" = "me@gmail.com",
      "Passwd" = "abcd",
      "service" = "finance",
      "source" = "Test-1"
  )
  </code></pre>
  
  <p>but go the following error:</p>
  
  <pre><code>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
  </code></pre>
  
  <p>How do I setup RCurl to allow use of HTTPs?</p>