# File lib/openid_connect/discovery/provider/config.rb, line 5
        def self.discover!(identifier, cache_options = {})
          uri = URI.parse(identifier)
          Resource.new(uri).discover!(cache_options).tap do |response|
            response.expected_issuer = identifier
            response.validate!
          end
        rescue SWD::Exception, ValidationFailed => e
          raise DiscoveryFailed.new(e.message)
        end