When using a DAV write-through proxy the slave will be out-of-date w.r.t. the
master immediately after a commit for a short period. During that period update
in the committed working copy will fail because the committed parts are at a
newer revision than the slave.
Neon gives a more user-friendly error message than serf:
$ svn up wc2 --config-option servers:global:http-library=serf
Updating 'wc2':
svn: E175002: REPORT request on '/slave/!svn/vcc/default' failed: 500 Internal
Server Error
$ svn up wc2 --config-option servers:global:http-library=neon
Updating 'wc2':
svn: E000000: A reported revision is higher than the current repository HEAD
revision. Perhaps the repository is out of date with respect to the master
repository?