cephfs:error downloading file when using ownCloud UI

[labkode]

Error probably triggered because the upstream Web does not append token as query parameter.

@jouvin @nlegrand @guillaume-philippon

[jouvin]

To be more precise about the error:

• IJCLab is using a different virtual host for the web interface and the Reva backend
• There is not an error strictly speaking but when the upload request is passed to the backend, the backend ask the user to authenticate with a username/password which makes no sense.

Diagnostic that it is caused by a missing token in the request forwarded to the backend looks sensible.