debug check_origin on render

config/runtime.exs

@@ -48,7 +48,11 @@ if config_env() == :prod do
       You can generate one by calling: mix phx.gen.secret
       """
 
-  host = System.get_env("PHX_HOST") || "example.com"
+  host =
+    System.get_env("PHX_HOST") ||
+      "example.com"
+      |> IO.inspect()
+
   port = String.to_integer(System.get_env("PORT") || "4000")
 
   config :something_erlang, :dns_cluster_query, System.get_env("DNS_CLUSTER_QUERY")
@@ -63,6 +67,7 @@ if config_env() == :prod do
       ip: {0, 0, 0, 0, 0, 0, 0, 0},
       port: port
     ],
+    check_origin: [host],
     secret_key_base: secret_key_base
 
   # ## SSL Support