Phoenix application is continuously refreshing after adding domain name

[lubien]

This is likely an Phoenix configuration issue.

Take a look at this old case:

Phoenix LiveView constantly refreshes with custom domain

To expand on this, Phoenix enforces same origin for websockets by default, (check_origin: true endpoint config). By default, we will enforce the same origin as configured in your :url, but you can also provide a list of hosts if you have other needs. For example: config :my_app, MyAppWeb.Endpoint, check_origin: ["//example.com", "//another.com"] For applications generated with phx.new >= 1.6.3, the config/runtime.exs will use a PHX_HOST environment export if available to set the endpoint url…