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: servlet.rb
    path of file: ./repos/ruby/lib/rdoc
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require_relative '../rdoc'
require 'erb'
require 'time'
require 'json'

begin
  require 'webrick'
rescue LoadError
  abo
    
  def do_GET req, res
    req.path.sub!(/\A#{Regexp.escape @mount_path}/, '') if @mount_path

    case req.path
    when '/' then
      root req, res
    when '/js/darkfish.js', '/js/jquery.js', '/js/search.js',
         %r%^/css/%, %r%^/images/%, %r%^/fonts/% then
      asset :darkfish, req, res
    when '/js/navigation.js', '/js/searcher.js' then
      asset :json_index, req, res
    when '/js/search_index.js' then
      root_search req, res
    else
      show_documentation req, res
    end