AttributeError: '_io.BytesIO' object has no attribute 'headers'

[dahlia]

Traceback (most recent call last):
  File "/usr/bin/geofront-cli", line 9, in <module>
    load_entry_point('geofront-cli==0.2.2', 'console_scripts', 'geofront-cli')()
  File "/usr/lib/python3.4/site-packages/geofrontcli/cli.py", line 416, in main
    args.function(args)
  File "/usr/lib/python3.4/site-packages/geofrontcli/cli.py", line 354, in scp
    src_client, src_remote, src_path = parse_scp_path(args.source, args)
  File "/usr/lib/python3.4/site-packages/geofrontcli/cli.py", line 337, in parse_scp_path
    remote = client.authorize(alias)
  File "/usr/lib/python3.4/site-packages/geofrontcli/client.py", line 189, in authorize
    mimetype, _ = parse_mimetype(r.headers['Content-Type'])
AttributeError: '_io.BytesIO' object has no attribute 'headers'