OAuth via ApplicationLinks for Confluence no longer works

Confluence Development
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1

I have previously been able to go to https://SUB.atlassian.net/wiki/plugins/servlet/applinks/listApplicationLinks and create a new link, e.g. http://localhost:3002 filling out all the input boxes with dots (.) or other random characters, selecting Create incoming link, and on the next page adding my public key and consumer key.

In my app, I then use the Ruby gem oauth (as in the examples: Bitbucket) and go through the OAuth dance. I don’t get very far, since the oauth gem throws a 302 Found error, because it gets into a redirect loop.

The redirect loop seems to be:

/wiki/plugins/servlet/oauth/request-token
-> 
/login?application=confluence&dest-url=%2Fwiki%2Fplugins%2Fservlet%2Foauth%2Frequest-token
-> 
/login?application=confluence&dest-url=%2Fwiki%2Flogin
-> 
ERROR

All of this used to work, but now it don’t. What changed? What do I need to change to get it to work again?

2

It should be noted, that the exact same approach works for Jira Cloud and Jira Server, but don’t (anymore) for Confluence Cloud and Confluence Server.