Websockets/channel with distillery

I am building a release with Distillery and my prod.exs is

config :tech_bin, MyApp.Endpoint, server: true,
  check_origin: ["mysite.com","http://localhost:8080"]

config :tech_bin, MyApp.Endpoint,
  http: [port: {:system, "PORT"}],
  url: [host: "mysite.com",port: {:system, "PORT"}], 

Is this the best way or should it be 127.0.0.1?

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