Quota: WebDAV door returns `500 server error` when quota reached

[onnozweers]

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Dear dCache devs,

This is a minor thingy, but perhaps it's easy to fix.

When quota is reached, WebDAV doors sometimes return a clear error message:

[onno@ui ~]# curl --location --upload-file testfile https://dcachetest.grid.surfsara.nl:2881/users/onno/disk/quota4
Internal problem: REPLICA user quota exceeded for uid=99999

But with curl --fail, the error is quite different and confusing:

[onno@ui ~]# curl --fail --location --upload-file testfile https://dcachetest.grid.surfsara.nl:2881/users/onno/disk/quota
curl: (22) The requested URL returned error: 500 Server Error

The user might think that dCache is broken! Surely we don't want the user to think that? 😉

Wouldn't it be better if WebDAV returned this HTTP code?

507 Insufficient Storage (WebDAV; RFC 4918)
The server is unable to store the representation needed to complete the request.

Another candidate might be "413 Payload Too Large".

Cheers, Onno