I have tried this out by setting the Keep-Alive time on our server to 2 secs and adding a Thread.sleep(5000) between two operations so that the stale connection problem can be reproduced: In DAVroid/0.5.11, the NoHttpResponseException (which is a soft I/O error) occurs because the HttpClient stale connection check is disabled AND there’s not appropriate retry strategy.
With the new DavHttpRequestRetryHandler, the request is retried on a new connection when the old connection has got stale (closed). The stale connection check is not required because at the moment, all used HTTP verbs are idempotent.
