This looks like it might be a configuration error on the doc.wm.o Apache, or missing a common default we normally enable on static servers.
This is particularly common to see because our publish jobs produce a clickable link without trailing slash.
+ rsync --archive --compress --delete-after . rsync://doc1001.eqiad.wmnet/doc/cover/visualeditor
Published at https://doc.wikimedia.org/cover/visualeditor
That could be fixed separately, but it'd be nice for general address-bar usability if things worked as expected when typing /cover or /cover/something