Cache both HEAD and GET requests separately in Fastly

blah.vcl

sub vcl_hash {
  set req.hash += req.url;
  set req.hash += req.http.host;
  if (req.http.request-method) {
    set req.hash += req.http.request-method;
  }
  return (lookup);
}

sub vcl_miss {
  #don't turn HEAD requests into GET requests
  if(req.http.request-method){
    set bereq.request = bereq.http.request-method;
    unset req.http.request-method;
  }

#FASTLY miss
  return(fetch);
}

sub vcl_pass {
  if(req.http.request-method){
    set bereq.request = bereq.http.request-method;
    unset req.http.request-method;
  }
#FASTLY pass
}

sub vcl_recv {
  if(req.request == "HEAD"){
    set req.http.request-method = req.request;
  }
  #and lot's more fun stuff...