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# File lib/rack/file.rb, line 59
    def serving(env)
      if env["REQUEST_METHOD"] == "OPTIONS"
        return [200, {'Allow' => ALLOW_HEADER, CONTENT_LENGTH => '0'}, []]
      end
      last_modified = F.mtime(@path).httpdate
      return [304, {}, []] if env['HTTP_IF_MODIFIED_SINCE'] == last_modified

      headers = { "Last-Modified" => last_modified }
      headers[CONTENT_TYPE] = mime_type if mime_type

      # Set custom headers
      @headers.each { |field, content| headers[field] = content } if @headers

      response = [ 200, headers, env[REQUEST_METHOD] == "HEAD" ? [] : self ]

      size = filesize

      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[2] = [response_body] unless response_body.nil?

      response[1][CONTENT_LENGTH] = size.to_s
      response
    end