6 methods override RequestPolicyInterface::check()

AllowToolbarPath::check in core/modules/toolbar/src/PageCache/AllowToolbarPath.php
ChainRequestPolicy::check in core/lib/Drupal/Core/PageCache/ChainRequestPolicy.php
CommandLineOrUnsafeMethod::check in core/lib/Drupal/Core/PageCache/RequestPolicy/CommandLineOrUnsafeMethod.php
DenyTestAuthRequests::check in core/modules/rest/tests/modules/rest_test/src/PageCache/RequestPolicy/DenyTestAuthRequests.php
DisallowBasicAuthRequests::check in core/modules/basic_auth/src/PageCache/DisallowBasicAuthRequests.php
NoSessionOpen::check in core/lib/Drupal/Core/PageCache/RequestPolicy/NoSessionOpen.php

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.