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* Fix WebDAV by requesting new ETag conditionally For me. this was saving only the first time and subsequently failing. Having revised the requests, I noticed it didn't get a new ETag after saving. Seems not all WebDAV implementations return a new ETag in PUT requests. In my WebDAV service (WsgiDAV) - ETag is only served from a HEAD request. So if no ETag is found with PUT - we request one with HEAD. This patch fixes error handling and should also work with servers that provide ETag directly upon PUT. * Add tweak from PMario