Comment (by Roland Haas):

This apparently (can) works from .htaccess files as well: https://help.dreamhost.com/hc/en-us/articles/215747748-How-can-I-redirect-and-rewrite-my-URLs-with-an-htaccess-file-

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2240/redirect-from-old-trac-ticket-urls-to