tox
Using this code and the staging deposit server, it is happy with the following:
```
Oct 12 11:03:21 deposit python3[181685]: 2020-10-12 11:03:21 [181685] gunicorn.access:INFO 127.0.0.1 - swh [12/Oct/2020:11:03:21 +0000] "PUT /1/swh/605/metadata/ HTTP/1.1" 204 0 "-" "python-requests/2.20.1"
```