content: import dash
  from dash import html
  
  
  dash.register_page(__name__, path_template="/a/<id_a>/b/<id_b>", id="register_page")
  
  
  def layout(id_a=None, id_b=None, **other_unknown_query_strings):
      return html.Div(
          [
              html.Div("text for register_page", id="text_register_page"),
              html.Div(f"variables from pathname:{id_a} {id_b}", id="path_vars"),
          ]
      )
  