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Appendix C
APPENDIX C
WebDAV and Autoversioning
WebDAV is an extension to HTTP, and is growing more and more popular as a stan-
dard for file-sharing. Today’s operating systems are becoming extremely Web-aware,
and many have now built-in support for mounting shares exported by WebDAV
servers.
If you use Apache/mod_dav_svn as your Subversion network server, then to some
extent, you are also running a WebDAV server. This appendix gives some back-
ground on the nature of this protocol, how Subversion uses it, and how well Subver-
sion interoperates with other software that is WebDAV-aware.
Basic WebDAV Concepts
This section provides a very brief, very general overview of the ideas behind Web-
DAV. It should lay the foundation for understanding WebDAV compatibility issues
between clients and servers.
Just Plain WebDAV
RFC 2518 defines a set of concepts and accompanying extension methods to HTTP
1.1 that make the Web into a more universal read/write medium. The basic idea is
that a WebDAV-compliant web server can act like a generic file server; clients can
mount WebDAV shares that behave much like NFS or SMB shares.
However, it’s important to note that RFC 2518 does not provide any sort of model
for version control, despite the V in DAV. Basic WebDAV clients and servers assume
only one version ...