Comment 8 for bug 1874831

I've tested my scenario and it works fine.

Just for completeness, tested on ubuntu focal 20.04 (amd64) docker image +
libnginx-mod-nchan 1.18.0-0ubuntu2 amd64
nginx-light 1.18.0-0ubuntu2 amd64

nchan is version 1.2.7

rhe configuration snippet used is:

location /publish {
  nchan_publisher;
  nchan_channel_id $arg_topic;
  nchan_publisher_upstream_request /authorize_pub;
}