[atlas] Empty responses for HTTP tests with a non-existing path?

It seems the anchors, when receiving a HTTP request for a non-existing path, instead of a 404, send a broken response: % curl -v http://fr-par-as2486.anchors.atlas.ripe.net/nonono * Trying 2001:67c:217c:4::2:80... * Connected to fr-par-as2486.anchors.atlas.ripe.net (2001:67c:217c:4::2) port 80 (#0)

GET /nonono HTTP/1.1 Host: fr-par-as2486.anchors.atlas.ripe.net User-Agent: curl/7.81.0 Accept: */*

* Empty reply from server * Closing connection 0 curl: (52) Empty reply from server