Here’s how I did it:

Create a new module to assign “current_uri” to your socket. I only set the path string to the assigns, since I don’t want/need the whole URI enchilada.

defmodule GamedropWeb.SaveRequestUri do
  def on_mount(:save_request_uri, _params, _session, socket),
    do:
      {:cont,
       Phoenix.LiveView.attach_hook(
         socket,
         :save_request_path,
         :handle_params,
         &save_request_path/3
       )}

  defp save_request_path(_params, url, socket),
    do: {:cont, Phoenix.Component.assign(socket, :current_uri, URI.parse(url) |> Map.get(:path))}
end

Call this module from your router.ex:

live_session :current_user,
  on_mount: [
    {GamedropWeb.UserAuth, :mount_current_user},
    {GamedropWeb.SaveRequestUri, :save_request_uri}
  ] do
  live("/users/co.... *snip*
end

And then you can just call this from your liveview templates or layouts.

<p>@current_uri} /></p>