from

A regular expression for the prefix to be mapped to the mirror site. 

to

The mirror site prefix. 

name

(Optional) A named object from which to derive the configuration for the mirror site. 

rewrite-host

(Optional) Indicates whether the Host HTTP request header is rewritten to match the host specified by the parameter. In a reverse proxy configuration where the proxy server and origin server service the same set of virtual servers, you may wish to specify rewrite-host="false". The default is "true", meaning that the Host HTTP request header is rewritten.