push_nginx.conf

# internal publish endpoint (keep it private / protected)
        location /publish {
          set $push_channel_id $arg_id; #/?id=239aff3 or somesuch
          push_publisher;
 
          push_store_messages on; # enable message queueing
          push_message_timeout 2h; # expire buffered messages after 2 hours
          push_max_message_buffer_length 10; # store 10 messages
          push_min_message_recipients 0; # minimum recipients before purge
        }
 
        # public long-polling endpoint
        location /activity {
          push_subscriber;
 
          # how multiple listener requests to the same channel id are handled
          # - last: only the most recent listener request is kept, 409 for others.
          # - first: only the oldest listener request is kept, 409 for others.
          # - broadcast: any number of listener requests may be long-polling.
          push_subscriber_concurrency broadcast;
          set $push_channel_id $arg_id;
          default_type text/plain;
        }