This is correct, Ceph's RadosGW doesn't support this feature.

For people trying to figure out if their provider is using Ceph, make a request for https://<s3-endpoint>/test and see if the x-amz-request-id header begins with "tx000", if it does, then they're using Ceph.

$ curl -sSi https://nyc3.digitaloceanspaces.com/test/ | grep x-amz-request-id

x-amz-request-id: tx00000947bc21a401c0f02-00651981d1-4b6a0-nyc3d

Do you mean Ceph Object gateway? I am not familiar with Ceph but does it have serious limitations?

Is this true? That's horrifying