Simple Rack web server for static files with index.html

config.ru

# This is the root of our app
@root = File.expand_path(File.join(File.dirname(__FILE__), "www"))

run Proc.new { |env|
  # Extract the requested path from the request
  req = Rack::Request.new(env)
  index_file = File.join(@root, req.path_info, "index.html")

  if File.exists?(index_file)
    # Rewrite to index
    req.path_info += "index.html"
  end
  # Pass the request to the directory app
  Rack::Directory.new(@root).call(env)
}