Adding in the option to look for the forwarded host and use that as our IP...

Adding in the option to look for the forwarded host and use that as our IP rather than the IP of any load-balancer

lib/Plack/Middleware/Throttle/ReLimiter.pm

@@ -17,4 +17,12 @@ sub _create_backend {
   die "backend must be a cache object";
 }
 
+sub client_identifier {
+  my ($self, $env) = @_;
+  if($env->{HTTP_X_FORWARDED_HOST}) {
+    return $self->key_prefix."_".$env->{HTTP_X_FORWARDED_HOST};
+  }
+  return $self->SUPER::client_identifier($env);
+}
+
 1;