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This fix is inserting the right canonical tag in the home page, thanks!
To document the entire change: in templates/layouts/_header.php, after the title tag, add:
<? if (!$routed) { ?>
<link rel="canonical" href="<?= preg_replace('/\/*$/', '', WWW_ROOT.$bigtree["page"]["path"]) ?>/" />
<? } ?>This is arguably a bug: http://www.designcollective.com/%20 and http://www.designcollective.com/ serve the same content.
I picked the above as an example BigTree install. We are on 4.2 and have the same problem.
The real-life consequence is that the moment someone linked us with a trailing space, Google picked it up as "duplicate content". This is now harming our search standing.
An immediate 301 to the real URL with whitespace stripped seems like the solution, but perhaps there are better ways to fix this.
Best,
Tushar