You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: index.rb
    path of file: ./repos/truffleruby/lib/mri/bundler/fetcher
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative "base"

module Bundler
  class Fetcher
    class Index < Base
      def specs(_gem_names)
        Bundler.rubygems.fetch_all_remote_specs(remote)
      rescue Gem::RemoteFetcher::FetchError => e
        case e.message
       
    
      def specs(_gem_names)
        Bundler.rubygems.fetch_all_remote_specs(remote)
      rescue Gem::RemoteFetcher::FetchError => e
        case e.message
        when /certificate verify failed/
          raise CertificateFailureError.new(display_uri)
        when /401/
          raise BadAuthenticationError, remote_uri if remote_uri.userinfo
          raise AuthenticationRequiredError, remote_uri
        when /403/
          raise BadAuthenticationError, remote_uri if remote_uri.userinfo
          raise AuthenticationRequiredError, remote_uri
        else
          raise HTTPError, "Could not fetch specs from #{display_uri} due to underlying error <#{e.message}>"
        end