Relayd as Transparent HTTP Proxy problem

[Keith]

I have been trying to get relayd to work as a Transparent http proxy on 
a old OBSD 4.7 server today but I am having some trouble getting it to 
do what I want. The transparent proxy works perfectly but I want to 
block access to all websites unless their on a whitelist in the 
relayd.conf file.  We have squid proxy that all our web traffic should 
go through but we also have some apps that just refuse to use a proxy 
that we think we could let through the transparent proxy.

http protocol "httpfilter" {
    tcp { nodelay, sack, socket buffer 65536, backlog 1000 }
    return error
    header change "Keep-Alive" to "$TIMEOUT"
    header change "Connection" to "close"
    request header log "Host"
    label "Unauthorised Host please contact support@xxxxxxxx"
    request header expect "undeadly.org" from "Host"
    request header expect "*undeadly.org*" from "Host"

#   label "BAD user agent"
#   request header filter "Mozilla/4.0*" from "User-Agent"
#   request header filter "SomeBrokeBrowser/1.0*" from "User-Agent"

#   label "BAD Host request"
#    request header filter "*youtube.com*" from "Host"
#    request header filter "*myspace.com*" from "Host"
#    request header filter "*facebook.com*" from "Host"
#    request header filter "*bfriends.com*" from "Host"

    request header change "Accept" to 
"text/html,text/plain;q=0.9,*/*;q=0.8"
    request header change "Accept-Charset" to "ISO-8859-1,utf-8;q=0.9"
    request header change "Accept-Encoding" to "gzip"
    request header change "Accept-Language" to "en-us,en;q=0.9"
    request header change "User-Agent" to "InVis"
}

relay httpproxy {
        listen on 127.0.0.1 port 8080
        protocol "httpfilter"
        forward to nat lookup
}


When the above config is loaded and I visit the undeadly website I just 
get the following error.

Forbidden
incomplete request
OpenBSD relayd at 127.0.0.1 port 8080

Can someone help ?

Thanks
Keith