使用Rcurl和HTTPs

Question

我在Windows上的R中尝试了以下代码:

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

但是出现以下错误:

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

如何设置RCurl以允许使用HTTP？

Answer 1

只需将.opts = list(ssl.verifypeer = FALSE)添加到您的查询中

postForm("https://www.google.com/accounts/ClientLogin/",
    "email" = "me@gmail.com",
    "Passwd" = "abcd",
    "service" = "finance",
    "source" = "Test-1",
    .opts = list(ssl.verifypeer = FALSE))

Answer 2

您需要安装SSL库.

1. 对于Windows,你可以在这里找到一个:下载"OpenSSL for Windows"版本0.9.8k

2. 解压缩到临时文件夹,并将文件"libeay32.dll"和"ssleay32.dll"从"bin"子文件夹复制到R\library\RCurl\lib\i386.

3. 您也可以将其复制到与R.exe相同的目录中.

4. 然后检查您是否可以访问https协议:

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

5. 然后安装一组新的凭据文件:

   ca-bundle.crt可以在以下网址找到:http://curl.haxx.se/ca/cacert.pem

   重命名/复制到ca-bundle.crt

6. 用这个测试:

   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")