Created Unassigned: WebDav does not work (Did not find initial path) [680]

When trying to access my WebDav server (nginx with WebDav configuration) I get simple Error dialog with text "Did not find initial path"

Log from nginx:

94.112.253.171 - martin [10/Feb/2017:11:48:49 +0100] "PROPFIND /dav/kp HTTP/1.1" 207 576 "-" "okhttp/3.4.1" 0.000 <"<?xml version=\x221.0\x22 encoding=\x22UTF-8\x22?>\x0A<d:propfind xmlns:d=\x22DAV:\x22>\x0A <d:prop><d:displayname/><d:ge
tlastmodified/><d:getcontentlength/></d:prop>\x0A</d:propfind>\x0A" >"<?xml version=\x221.0\x22 encoding=\x22utf-8\x22 ?>\x0A<D:multistatus xmlns:D=\x22DAV:\x22>\x0A<D:response>\x0A<D:href>/dav/kp</D:href>\x0A<D:propstat>\x0A<D:prop>\x0A
<D:creationdate>2017-02-03T11:53:05Z</D:creationdate>\x0A<D:displayname>kp</D:displayname>\x0A<D:getcontentlanguage/>\x0A<D:getcontentlength>10958</D:getcontentlength>\x0A<D:getcontenttype/>\x0A<D:getetag/>\x0A<D:getlastmodified>Fri, 03
Feb 2017 11:53:05 GMT</D:getlastmodified>\x0A<D:lockdiscovery/>\x0A<D:resourcetype/>\x0A<D:source/>\x0A<D:supportedlock/>\x0A</D:prop>\x0A<D:status>HTTP/1.1 200 OK</D:status>\x0A</D:propstat>\x0A</D:response>\x0A</D:multistatus>\x0A"