I’m not familiar with Drupal, and I could not find anything clear about what
private://activitypub/cache means in terms of UNIX. After fiddling around I figured it might be by default
$app_root/sites/default/files/activitypub/cache but it does not seem to be the case. I tried using
$settings, etc. but never found a good solution: I’m stuck with the following errors:
If only I knew what is the corresponding path on the filesystem I could check for permissions. All the permissions are OK for
www-data user which is running the PHP process.
Apart from this I have a running drupal 8 (9 would not install!) at https://drupal.demo.activitypub.eu that alledgedly support ActivityPub