fix DAV class from 2 to 1,2 (like apache) #46
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I have found that most clients require a dav class1 to work
For example, davfs2 or fuse-wdfs check class1 and if they don't find it, they write it.
/sbin/mount.davfs: mounting failed; the server does not support WebDAV
I checked with wireshark that the lua-nginx-module puts the header "dav"="2" while the apache server puts the header "dav"="1,2" and therefore davfs and wdfs work with apache without problems and do not work with nginx.
The proposed patch displays the dav version as well as apache.