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It is possible to create circular redirects in UrlShortener
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Description

From T112950#1720386:

Marking as low priority because it's not a blocker AIUI (please correct me if I'm wrong).

Event Timeline

Legoktm created this task.Oct 18 2015, 7:36 AM
Legoktm raised the priority of this task from to Low.
Legoktm updated the task description. (Show Details)
Legoktm added subscribers: Legoktm, dpatrick.
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Framawiki closed this task as Invalid.Apr 13 2019, 9:46 AM
Framawiki added a subscriber: Framawiki.

Looks already solved: entering https://w.wiki/ in https://meta.wikimedia.org/wiki/Special:UrlShortener?uselang=en shows URLs to domain w.wiki are not allowed to be shortened.

Framawiki reopened this task as Open.Apr 13 2019, 9:51 AM

Oh, as said in task desc it is possible to play with Special:UrlRedirector that is not blocked. For example, https://w.wiki/wE redirects to https://meta.wikimedia.org/wiki/Special:UrlRedirector/wE, and that last redirects to itself.

I guess we can block shortening to Special:UrlRedirector?