nginx pushstream config with non working push_stream_padding_by_user_agent

pushstream_problem.conf

# This file is included in main nginx config file
# push-stream module configuration
push_stream_shared_memory_size 256M;
push_stream_message_ttl 60s;
push_stream_max_messages_stored_per_channel 32;


server {

    listen 80;
    server_name ts02.amvtek.com;

    location = / {

	default_type text/plain;
	# I change response string so that I am sure config has been deployed
	return 200 ":\r\n\r\n\r\n<CONFIG>19</CONFIG>\r\n";
    }


    location ~ /publish/(.*) {
	
	push_stream_publisher admin; 
	#push_stream_store_messages on; 
	push_stream_channels_path $1;
    }

    location ~ /listen/(.*) {
	
	push_stream_subscriber eventsource; 
	push_stream_channels_path $1;
    }

    location ~ /ie89/listen/(.*) {
	
	push_stream_subscriber eventsource; 
	push_stream_channels_path $1;

	push_stream_padding_by_user_agent "IE,2000,0";

    }

}