If you access gerrit.wikimedia.org via http you are redirected to https. But URLs with a semicolon are broken after the redirect:
https://gerrit.wikimedia.org/r/gitweb?p=operations/puppet.git;a=tree;f=files/apache/sites;h=14baed1d9e959206c8fa15a6ff8e79bac2d04ab0;hb=HEAD
works,
but
http://gerrit.wikimedia.org/r/gitweb?p=operations/puppet.git;a=tree;f=files/apache/sites;h=14baed1d9e959206c8fa15a6ff8e79bac2d04ab0;hb=HEAD
redirects to
https://gerrit.wikimedia.org/r/gitweb?p=operations/puppet.git%3ba=tree%3bf=files/apache/sites%3bh=14baed1d9e959206c8fa15a6ff8e79bac2d04ab0%3bhb=HEAD
which gives a 404.
Version: unspecified
Severity: normal
URL: http://gerrit.wikimedia.org/r/gitweb?p=operations/puppet.git;a=tree;f=files/apache/sites;h=14baed1d9e959206c8fa15a6ff8e79bac2d04ab0;hb=HEAD