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[Duplicity-tracker] [bug #22494] webdav backend uses keep-alive, but doe

From: Peter Schuller
Subject: [Duplicity-tracker] [bug #22494] webdav backend uses keep-alive, but does not handle it
Date: Wed, 05 Mar 2008 19:09:59 +0000
User-agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US; rv: Gecko/20080126 Firefox/


                 Summary: webdav backend uses keep-alive, but does not handle
                 Project: duplicity
            Submitted by: scode
            Submitted on: Wednesday 03/05/2008 at 19:09
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any



The webdav backend uses a single persistent HTTP connection, by way of
keepalive. However, when using keepalive the client must be prepared to
re-submit requests as the server can close the connection at any time.

This causes backups to fail when the server-side keepalive timeout is
reached, while downloading signatures and such.

I will fix this myself, but I first want to get a couple of other patches
submitted (the webdav url fixing + the asynchronous upload bits, the latter of
which will introduce some utilities I want). Filing as a bug in the meantime.

The two possible suggested fixes:

* Re-establish a connection each time.
* Actually support re-submission; but this is not recommended from my end
since it is somewhat difficult to detect the failure mode (and we do not want
to cause double-submissions of entire volumes; though I have not yet
investigated if this affects uploads).


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