anchor.diff:  certificates. If the cacert is empty or missing, the SSL identity will not request
   or verify the peer certificate.
   
  +The `cert`, `privkey`, and `cacert` parameters may be file paths or full PEM formatted
  +string values.
  +
   The `version` parameter is the supported TLS version. This may be specified as a
   single version "TLS1.2" or a range "TLS1.0-TLS1.2". Supported constants are TLS1.0,
   TLS1.1, TLS1.2, and TLS1.3. Leaving the version empty specifies the default, TLS 1.2.
  
positive.code: 
  The `cert` parameter contains the certificate chain sent to clients that want to
  establish a secure connection. The `privkey` parameter is the private key associated 
  with the main certificate in the chain.
  
  The `cacert` parameter contains the certificate authority used to authenticate the 
  certificate chain presented by the other end of the connection. The cacert may
  
negative.code:       ciphers: !opt String
        keylog: !opt String
  
  *cert*:: PEM certificate chain.
  
  *privkey*: PEM private key associated with given `cert`.
  
  