Glance plugin in XenApi should use "Expect: 100-continue" header during upload.

[Sridevi Koushik]

During upload, if the Auth token is expired, the xenapi glance plugin in Nova
unnecessarily uploads the chunks and fails at the end.
Instead, we could have a fail fast mechanism using the
100-continue handshake. Only if the client receives a 100 continue
from glance, it should continue uploading the chunks.
Otherwise, if a 401 is received, it should fetch a fresh auth
token and retry the request.

[Sridevi Koushik (sridevik)]

Depends on bp: https://blueprints.launchpad.net/nova/+spec/use-buffered-http-in-glance-plugin

[Erno Kuvaja (jokke)]

As it becomes clear from the bp, this is feature request, not a bug on glance.