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Currently the IDE uses the URI syntax $repo/!svn/ver/$rev/$path to load historical file contents for the purpose of displaying diffs. This generally works but is not guaranteed to do so, according to http://subversion.tigris.org/webdav-usage.html because SVNSpecialURI could be changed. For SVN 1.6 servers (see release notes in URL), could use $repo/$path?p=$rev&r=$rev Not clear how to decide which style to use - is there some quick way to check whether a server is 1.6+? mod_svn does not seem to send a version header.