WEBrick dummy server

server.rb

require 'webrick'
json = File.read("./file.json")
class Server < WEBrick::HTTPServlet::AbstractServlet
  def initialize(server, json)
    super(server)
    @json = json
  end

  def do_GET(request, response)
    response.status = 200
    response['Content-Type'] = 'application/text'
    response.body = @json
  end
end

server = WEBrick::HTTPServer.new :Port => 8000
server.mount "/bla", Server, json

trap 'INT' do server.shutdown end
pid = fork {  server.start }
puts `curl localhost:8000/bla --max-time 1` # then I can talk to the webrick
Process.kill('INT', pid)