Correct transaction management. cf. bug https://openrdf.atlassian.net/browse/SES-2295 and tomcat default management of PUT request with form data (application/x-www-form-urlencoded encoded)
<IfModule mpm_peruser_module>
MinSpareProcessors <%= @minspareprocessors %>
MinProcessors <%= @minprocessors %>
MaxProcessors <%= @maxprocessors %>
MaxClients <%= @maxclients %>
MaxRequestsPerChild <%= @maxrequestsperchild %>
IdleTimeout <%= @idletimeout %>
ExpireTimeout <%= @expiretimeout %>
KeepAlive <%= @keepalive %>
Include "<%= @mod_dir %>/peruser/multiplexers/*.conf"
Include "<%= @mod_dir %>/peruser/processors/*.conf"
</IfModule>