    # File lib/chef/cookbook_version.rb, line 892
        def self.available_versions(cookbook_name)
          chef_server_rest.get_rest("cookbooks/#{cookbook_name}")[cookbook_name]["versions"].map do |cb|
            cb["version"]
          end
        rescue Net::HTTPServerException => e
          if e.to_s =~ /^404/
            Chef::Log.error("Cannot find a cookbook named #{cookbook_name}")
            nil
          else
            raise
          end
        end