A top level initializer is highly recommended to use:
conf/initializer/tls_settings.rb
OpenSSL::SSL::SSLContext::DEFAULT_PARAMS[:ssl_version] = ‘TLSv1_2‘使用github oauth 出现 OpenSSL::SSL::SSLError - SSL_connect SYSCALL returned=5 errno=0 state=SSLv2/v3 解决
原文：http://www.cnblogs.com/or2-/p/7816934.html