Comment 1 for bug 1806468

Huh... this reminds me a lot of https://bugs.launchpad.net/swift/+bug/1758710 ... I wonder if the listing_formats middleware isn't getting inserted where we expected it to be inserted? Following https://review.openstack.org/#/c/449394/ the proxy should always be requesting JSON listings, and the listing_formats middleware *should* get placed far enough left in the pipeline that it middlewares like staticweb, dlo, and symlink will always get back JSON...