RequestPolicyInterface
interface RequestPolicyInterface (View source)
Defines the interface for request policy implementations.
The request policy is evaluated in order to determine whether delivery of a cached page should be attempted. The caller should do so if static::ALLOW is returned from the check() method.
Constants
| ALLOW |
Allow delivery of cached pages. |
| DENY |
Deny delivery of cached pages. |
Methods
Determines whether delivery of a cached page should be attempted.
Details
string|null
check(Request $request)
Determines whether delivery of a cached page should be attempted.
Note that the request-policy check runs very early. In particular it is not possible to determine the logged in user. Also the current route match is not yet present when the check runs. Therefore, request-policy checks need to be designed in a way such that they do not depend on any other service and only take in account the information present on the incoming request.
When matching against the request path, special attention is needed to support path prefixes which are often used on multilingual sites.