处理机架中的WebSocket连接

这个 readme 对于 faye-websocket-ruby 具有以下示例。代码行是什么

p [:close, event.code, event.reason]

做什么 p 是吗?还有什么 ws.rack_response 做,为什么有必要?

# app.rb
require 'faye/websocket'

App = lambda do |env|
  if Faye::WebSocket.websocket?(env)
    ws = Faye::WebSocket.new(env)

    ws.on :message do |event|
      ws.send(event.data)
    end

    ws.on :close do |event|
      p [:close, event.code, event.reason]
      ws = nil
    end

    # Return async Rack response
    ws.rack_response

  else
    # Normal HTTP request
    [200, {'Content-Type' => 'text/plain'}, ['Hello']]
  end
end