code: public void setVerifyClient(String verifyClient)
      throws ConfigException
    {
      if (! "optional_no_ca".equals(verifyClient)
          && ! "optional-no-ca".equals(verifyClient)
          && ! "optional".equals(verifyClient)
          && ! "require".equals(verifyClient)
          && ! "none".equals(verifyClient))
        throw new ConfigException(L.l("'{0}' is an unknown value for verify-client.  Valid values are 'optional-no-ca', 'optional', and 'require'.",
                                      verifyClient));
  
      if ("none".equals(verifyClient))
        _verifyClient = null;
      else
        _verifyClient = verifyClient;
    }
docs: Sets the verifyClient.