Comment 8 for bug 1518431

One of the things triggering this misbehavior is that glanceclient is not sending the request's content-lenght and therefore, Glance doesn't know the image/request size when the call to the store is made.

Unfortunately, there's a bit more to this issue since this doesn't happen deterministically. There seems to be a race in the swift driver that's causing the first conflict error, which then makes the subsequent requests fail.