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: static.rb
    path of file: ./repos/rack/lib/rack
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative 'constants'
require_relative 'files'
require_relative 'mime'

module Rack

  # The Rack::Static middleware intercepts requests for static files
  # (javascript files, images, stylesheets, etc) based on the url prefixes or
  # route mappings passed in the options, and serves them using a Rack::Files
  # object. This allows a Rack stack to serve both static and dynamic content.
  #
  
    
    def applicable_rules(path)
      @header_rules.find_all do |rule, new_headers|
        case rule
        when :all
          true
        when :fonts
          /\.(?:ttf|otf|eot|woff2|woff|svg)\z/.match?(path)
        when String
          path = ::Rack::Utils.unescape(path)
          path.start_with?(rule) || path.start_with?('/' + rule)
        when Array
          /\.(#{rule.join('|')})\z/.match?(path)
        when Regexp
          rule.match?(path)
        else
          false
        end
      end