dav delete gets 401

Hi,

I've a very simple nginx setup with the standard dav module:

client_body_temp_path /tmp/nginx-client-tmp 1 2;
create_full_put_path on;
client_max_body_size 50m;
dav_access user:rw group:rw all:r;
dav_methods PUT DELETE;

PUT and GET work as expected but DELETE returns 401:

"DELETE /file.name HTTP/1.1" 401

How to fix this?

TIA