# File lib/rack/file.rb, line 55
    def serving(env)
      # NOTE:
      #   We check via File::size? whether this file provides size info
      #   via stat (e.g. /proc files often don't), otherwise we have to
      #   figure it out by reading the whole file into memory.
      size = F.size?(@path) || Utils.bytesize(F.read(@path))

      response = [
        200,
        {
          "Last-Modified"  => F.mtime(@path).httpdate,
          "Content-Type"   => Mime.mime_type(F.extname(@path), 'text/plain')
        },
        self
      ]
      response[1].merge! 'Cache-Control' => @cache_control if @cache_control

      ranges = Rack::Utils.byte_ranges(env, size)
      if ranges.nil? || ranges.length > 1
        # No ranges, or multiple ranges (which we don't support):
        # TODO: Support multiple byte-ranges
        response[0] = 200
        @range = 0..size-1
      elsif ranges.empty?
        # Unsatisfiable. Return error, and file size:
        response = fail(416, "Byte range unsatisfiable")
        response[1]["Content-Range"] = "bytes */#{size}"
        return response
      else
        # Partial content:
        @range = ranges[0]
        response[0] = 206
        response[1]["Content-Range"]  = "bytes #{@range.begin}-#{@range.end}/#{size}"
        size = @range.end - @range.begin + 1
      end

      response[1]["Content-Length"] = size.to_s
      response
    end