The updated resource mapping with the default settings

main.rs

App::with_state(State{db: addr.clone()})
  // the default_resource call here uses a closure
  // to return 405 Method Not Allowed error for 
  // all routes
  .default_resource(|r| {
     r.route().filter(pred::Not(pred::Get()))
         .f(|req| HttpResponse::MethodNotAllowed());
  })
  .resource("/", |r| r.method(http::Method::GET).f(index))
  .resource("/conspiracies/{page_id}", |r| r.method(http::Method::GET).a(get_conspiracies_by_id))
  .resource("/tags", |r| r.method(http::Method::GET).a(get_tags))
  .resource("/conspiracies", |r| r.method(http::Method::GET).a(get_conspiracies))