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Use case for SyncML: http://forum.nginx.org/read.php?2,249462,249668#msg-249668

location /app/syncml {
  ajp_keep_conn on;
  ajp_pass tomcatbackend:8009;
  include ./conf/proxy.conf;
  proxy_set_header Accept-Encoding "";
  keepalive_timeout 600;
  keepalive_requests 500;
  proxy_http_version 1.1;
  proxy_ignore_client_abort on;
}

Deals with a tomcat backend handling SyncML protocol.