Deprecated function: stripos(): Passing null to parameter #1 ($haystack) of type string is deprecated in Drupal\Core\EventSubscriber\ActiveLinkResponseFilter->onResponse() (line 82 of core/lib/Drupal/Core/EventSubscriber/ActiveLinkResponseFilter.php).
Deprecated function: stripos(): Passing null to parameter #1 ($haystack) of type string is deprecated in Drupal\Core\EventSubscriber\RssResponseRelativeUrlFilter->onResponse() (line 24 of core/lib/Drupal/Core/EventSubscriber/RssResponseRelativeUrlFilter.php).

Locating copies of objects using the Domain Name System

PUBLICATION: Locating copies of objects using the Domain Name System