https://bugzilla.wikimedia.org/show_bug.cgi?id=61553

            Bug ID: 61553
           Summary: Percent-escaped slashes and colons should not be
                    alternative page URLs
           Product: Wikimedia
           Version: wmf-deployment
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Apache configuration
          Assignee: wikibugs-l@lists.wikimedia.org
          Reporter: wikipe...@luke.wf
       Web browser: ---
   Mobile Platform: ---

The Apache or MediaWiki configuration for Wikipedia appears to decode
percent-encoded "/"s and ":"s in URLs. 

This means that, for example, https://en.wikipedia.org/wiki/Wikipedia%3AAbout
shows the same page as https://en.wikipedia.org/wiki/Wikipedia:About.

Similarly,
https://en.wikipedia.org/wiki/Wikipedia_talk%3AArbitration%2FRequests%2FCase%2FShakespeare_authorship_question%2FProposed_decision
is a valid URL for
https://en.wikipedia.org/wiki/Wikipedia_talk:Arbitration/Requests/Case/Shakespeare_authorship_question/Proposed_decision.

The escaping results in incredibly-verbose robots.txt rules, see
https://en.wikipedia.org/robots.txt , but even our existing rules don't account
for %2Fs in place of "/"s. 

We should either redirect or reject these URLs.

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