Hi

I am trying to configure NGINX to send another http request after successful completion of the original proxied request, in order to count statistics etc'
I am using post_action with proxy_pass as following:

location / {
proxy_http_version 1.1;
proxy_set_header HOST $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-Port 1061;
proxy_set_header X-Forwarded-Host $host:1061;
proxy_set_header X-Forwarded-Server $host:1061;
proxy_read_timeout 86400;
proxy_max_temp_file_size 0;
proxy_set_header Connection "";

set $backend rack-storage-radosgw:8802;

proxy_pass http://$backend;

post_action /send_event;
}

location /send_event {
proxy_method POST;
set $s3_proxy_request s3-proxy-manager:8946/internal/api/v3/s3proxies/actions/raise_event;
proxy_pass http://$s3_proxy_request;
}


The request in location / is sent to rack-storage-radosgw.service.strato and is completed successfully, but the request to s3-proxy-manager is not sent at all. I used tcpdump to capture any traffic on port 8946 and no traffic arrived. I also checked that send_event location is entered by code, and it does ( using rewrite_by_lua_block).
What am i doing wrong?
Thanks