protected function PageCache::getCacheId

Gets the page cache ID for this request.

Parameters

\Symfony\Component\HttpFoundation\Request $request: A request object.

Return value

string The cache ID for this request.

File

core/modules/page_cache/src/StackMiddleware/PageCache.php, line 349

Class

PageCache

Executes the page caching before the main kernel takes over the request.

Namespace

Code

protected function getCacheId(Request $request) {

  // Once a cache ID is determined for the request, reuse it for the duration
  // of the request. This ensures that when the cache is written, it is only
  // keyed on request data that was available when it was read. For example,
  // the request format might be NULL during cache lookup and then set during
  // routing, in which case we want to key on NULL during writing, since that
  // will be the value during lookups for subsequent requests.
  if (!isset($this->cid)) {
    $cid_parts = [
      $request
        ->getSchemeAndHttpHost() . $request
        ->getRequestUri(),
      $request
        ->getRequestFormat(NULL),
    ];
    $this->cid = implode(':', $cid_parts);
  }
  return $this->cid;
}