问题
Actually -- question title tells almost everything. In earlier Rails (2.x) I've seen code that was accessing client certificate details via request.env hash. My rack app is receiving call with env argument, but this data is not there. How can I access it?
回答1:
You should enable this on web server e.g. in Apache do SSLOptions +ExportCertData and/or +StdEnvVars. So you will get SSL_* vars in env.
来源：https://stackoverflow.com/questions/7726182/how-to-access-ssl-client-certificate-from-rack-app