[[!comment format=mdwn
 username="joey"
 subject="""comment 2"""
 date="2015-12-11T15:08:30Z"
 content="""
The first failure is git-annex sending MKCOL (make directory basically).
The server fails with "Unauthorized". You say it also made the directory.
That's got to be a bug in the server, no? It can't sanely have an
authorization problem and also go on and do the unathorized action.
(Sounds rather like a security hole..)

As to the PUT failure, the chunked transfer encoding mentioned in that
comment is a regular part of the HTTP protocol (this is not connected
to git-annex's own chunking).
<https://en.wikipedia.org/wiki/Chunked_transfer_encoding>

Looks like this PHP webdav server might be delegating the actual HTTP
to whatever web server it's running on somehow. Since chunked transfer
encoding might not be supported by some web server, they are left trying to
detect that. I don't know if their check for that is accurate.

As to the implementation in git-annex,
Network.Http.Client.RequestBodyStreamChunked is documented to be the only
thing that causes a chunked request body to be sent, and git-annex is using
RequestBodyLBS instead. Unless the documentation is wrong (and I also 
looked at the http-client source code and the documentation seems accurate),
I am doubtful that the chunked transfer encoding is actually being used by
git-annex. If eg a protocol dump shows that it is in fact using chunked
transfer encoding (ie, contains "Transfer-Encoding: chunked"),
that would be grounds to file a bug on the http-client library.

Aah, but.. git-annex is sending an empty file. And the webdav server's
check consists of reading 1 byte. 
Of course there's not a byte to read if an empty file is being sent!
So that code you showed is certianly buggy.

I've changed git-annex to send a non-empty file when testing the webdav
server to work around this.
"""]]