 
           [host: "localhost", path: "/"]
 
-      The `:port` option requires either an integer, string, or
-      `{:system, "ENV_VAR"}`. When given a tuple like `{:system, "PORT"}`,
-      the port will be referenced from `System.get_env("PORT")` at runtime
-      as a workaround for releases where environment specific information
-      is loaded only at compile-time.
-
-      The `:host` option requires a string or `{:system, "ENV_VAR"}`. Similar
-      to `:port`, when given a tuple like `{:system, "HOST"}`, the host
-      will be referenced from `System.get_env("HOST")` at runtime.
+      The `:port` option requires either an integer or string. The `:host`
+      option requires a string.
 
       The `:scheme` option accepts `"http"` and `"https"` values. Default value
       is inferred from top level `:http` or `:https` option. It is useful


      # Compile after the debugger so we properly wrap it.
      @before_compile Phoenix.Endpoint
      @phoenix_render_errors var!(config)[:render_errors]
    end
  end


        rescue
          e in Plug.Conn.WrapperError ->
            %{conn: conn, kind: kind, reason: reason, stack: stack} = e
            Phoenix.Endpoint.RenderErrors.__catch__(conn, kind, reason, stack, config(:render_errors))
        catch
          kind, reason ->
            stack = System.stacktrace()
            Phoenix.Endpoint.RenderErrors.__catch__(conn, kind, reason, stack, config(:render_errors))
        end
      end

