Ruby Async Proxy

proxy.rb

class Proxy
  def initialize(port:, host:)
    @port, @host = port, host
    @destination = "#{@host}:#{@port}"
    @client = Async::HTTP::Client.new(
      Async::HTTP::URLEndpoint.parse(
        "http://#{@destination}"
      )
    )
  end

  def call(request)
    # Do something with the request.

    @client.call(request)
  end
end

endpoint = Async::HTTP::URLEndpoint.parse(
  "http://localhost:3000"
)

proxy = Proxy.new(
  host: "localhost", port: 4242
)

Async::Reactor.run do
  Async::HTTP::Server.new(proxy, endpoint).run
end