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: fastly.rb
    path of file: ./repos/forem/app/services/edge_cache/bust
    
    the code of the file until where you have to start completion: module EdgeCache
  class Bust
    class Fastly
      # [@forem/systems] Fastly-enabled Forems don't need "flexible" domains.
      def self.call(path)
        fastly_purge(path)
      end

      def 
    
      def self.fastly_purge(path)
        headers = { "Fastly-Key" => ApplicationConfig["FASTLY_API_KEY"],
                    "User-Agent" => "#{Settings::Community.community_name} (#{URL.url})" }

        urls(path).map do |url|
          HTTParty.post("https://api.fastly.com/purge/#{url}", headers: headers)
        end
      end