getRequestForPath example

$path_elements = explode('/', $path);
    $exclude = [];
    // Don't show a link to the front-page path.     $front = $this->config->get('page.front');
    $exclude[$front] = TRUE;
    // /user is just a redirect, so skip it.     // @todo Find a better way to deal with /user.     $exclude['/user'] = TRUE;
    while (count($path_elements) > 1) {
      array_pop($path_elements);
      // Copy the path elements for up-casting.       $route_request = $this->getRequestForPath('/' . implode('/', $path_elements)$exclude);
      if ($route_request) {
        $route_match = RouteMatch::createFromRequest($route_request);
        $access = $this->accessManager->check($route_match$this->currentUser, NULL, TRUE);
        // The set of breadcrumb links depends on the access result, so merge         // the access result's cacheability metadata.         $breadcrumb = $breadcrumb->addCacheableDependency($access);
        if ($access->isAllowed()) {
          $title = $this->titleResolver->getTitle($route_request$route_match->getRouteObject());
          if (!isset($title)) {
            // Fallback to using the raw path component as the title if the             // route is missing a _title or _title_callback attribute.
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