RESTClient实现:: SSLCertificateNotVerified

Question

我向网址发送帖子请求以获取访问令牌。

result = RestClient.post('https://stackexchange.com/oauth/access_token',
                        {:client_id => CLIENT_ID,
                         :client_secret => CLIENT_SECRET,
                         :code => session_code,
                         :redirect_uri => 'http://rails.example.com:3000/stackoverflow/callback'},
                         #:verify_ssl => false,
                         )

但错误如下：

RestClient::SSLCertificateNotVerified in StackoverflowController#callback
SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate verify failed

即使我将verify_ssl设置为false，仍然无效，希望有人可以帮助我，提前谢谢！

ruby version: ruby 2.2.2p95
rails version: Rails 4.2.3
rest-client (1.8.0)