public function HeadersCacheContext::getContext
public HeadersCacheContext::getContext($header = NULL)
Returns the string representation of the cache context.
A cache context service's name is used as a token (placeholder) cache key, and is then replaced with the string returned by this method.
Parameters
string|null $parameter: The parameter, or NULL to indicate all possible parameter values.
Return value
string The string representation of the cache context. When $parameter is NULL, a value representing all possible parameters must be generated.
Throws
\LogicException Thrown if the passed in parameter is invalid.
Overrides CalculatedCacheContextInterface::getContext
File
- core/lib/Drupal/Core/Cache/Context/HeadersCacheContext.php, line 26
Class
- HeadersCacheContext
- Defines the HeadersCacheContext service, for "per header" caching.
Namespace
Drupal\Core\Cache\ContextCode
public function getContext($header = NULL) { if ($header === NULL) { return $this->requestStack->getCurrentRequest()->headers->all(); } else { return $this->requestStack->getCurrentRequest()->headers->get($header); } }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Cache!Context!HeadersCacheContext.php/function/HeadersCacheContext::getContext/8.1.x