Mount
| -- | ---------- | ------------------ | ---------------------------------- |
| * | MOUNT | "vURL rURL opt" | map virtual URL to/from real URL |
| * | URICONV | convList:attrList | control URI rewriting with MOUNT |
| BASEURL | URL | the base of (virtual) URL of this server | |
| DELEGATE | host:port | limited form of BASEURL |