class Rack::Static

def initialize(app, options = {})
  @app = app
  @urls = options[:urls] || ["/favicon.ico"]
  @index = options[:index]
  @gzip = options[:gzip]
  @cascade = options[:cascade]
  root = options[:root] || Dir.pwd
  # HTTP Headers
  @header_rules = options[:header_rules] || []
  # Allow for legacy :cache_control option while prioritizing global header_rules setting
  @header_rules.unshift([:all, { CACHE_CONTROL => options[:cache_control] }]) if options[:cache_control]
  @file_server = Rack::Files.new(root)
end