By wim leers on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
8.7.x
Introduced in version: 
8.7.0
Issue links: 
https://www.drupal.org/node/3003713
Description: 

Even though RFC6596 clearly says relative URLs are supported, but Google does not support it.

So we chose to be pragmatic and make our canonical links relations (and all others) absolute.

(This means we sacrifice some cacheability on Drupal sites that are exposed on multiple domains. The consequences of that are minimal though.)

Impacts: 
Site builders, administrators, editors
Themers