Simple http server in ruby, that ensures there's no browser caching. For serving static files in development.

server

#!/usr/bin/env ruby
require 'webrick'
require 'optparse'

class NonCachingFileHandler < WEBrick::HTTPServlet::FileHandler
  def prevent_caching(res)
    res['ETag'] = nil
    res['Last-Modified'] = Time.now + 100**4
    res['Cache-Control'] = 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0'
    res['Pragma'] = 'no-cache'
    res['Expires'] = Time.now - 100**4
  end

  def do_GET(req, res)
    super
    prevent_caching(res)
  end
end

options = { port: 8000 }
OptionParser.new do |opts|
  opts.banner = 'Usage: server [options]'

  opts.on('-p', '--port PORT', 'Specify the port') { |v| options[:port] = v }
end.parse!

server = WEBrick::HTTPServer.new(Port: options[:port])

server.mount('/', NonCachingFileHandler, Dir.pwd)
trap('INT') { server.stop }
server.start