curl -vH 'accept: application/activity+json' https://p.girlc.at/notice/AQlczRnPJInFF3DHIu
...
< location: https://p.girlc.at/objects/e0b43ee0-3f77-4287-8a11-92aad2e6bc09
...curled does not work. but as you can see it is a redirect. if you use the url the redirect wants you to go to it works