http delete with angular composite key 5

The question is how do I delete a record that has a key composed with the http delete method? the code that I have so far is

delete(categoria, i) {
    console.log(categoria);
    const cat = new CategoriaLugar(categoria.id_lugar, categoria.id_categoria, categoria.Lugar.nombre, categoria.Categorium.nombre)
    console.log(cat);

    const id = [categoria.id_lugar, categoria.id_categoria]
    if (confirm("¿Está seguro que desea eliminar la categoria " + cat.nombre_categoria + " del lugar " + cat.nombre_lugar + "?")) {
      this.service.deleteCategoria(cat).subscribe(
        result => delete this.categorias[i],
        error => alert("Error al eliminar")
      );;
    }

  }

However, I can not get you to delete the data