Fiddle - Fastly

recv
init
recv
hash
hit
miss
pass
fetch
error
deliver
log
Install
Run

if (req.http.host ~ "^(.+?\.){2}fiddle\.") {
    set req.url = regsub(req.url, "/", "/subcontent/");
}
#Here we check for a subdomain and rewrite the URL path from "/" to "/subcontent/"