logger.pm

#Placed under /usr/local/nginx/perl/lib/logger.pm
package logger;
                                                                                                                                                                                                                            
use nginx;
                                                                                                                                                                                                                                 
sub handler {
    my $r = shift;
    if ($r->request_method eq "POST") {
        open FILE, ">>/var/log/nginx/all.log" or return "";
        print FILE $r->request_body;
        close FILE;
    }
    return "";
}

1;

__END__

nginx.conf

user  www www;
worker_processes  64;
error_log  /var/log/nginx/error.log;
pid        /var/run/nginx.pid;

events {
    worker_connections  512;
}

http {
    include       mime.types;
    default_type  application/octet-stream;

    server_names_hash_bucket_size 128;

    log_format  main  '$host $remote_addr [$time_local] $status "$request" $body_bytes_sent "$http_referer" "$http_user_agent"';
    access_log  /var/log/nginx/access.log  main;

    sendfile        on;
    tcp_nopush     on;
    tcp_nodelay    on;

    perl_modules  perl/lib;
    perl_require  logger;

    server {
        listen       80 default;
        server_name  _;
        location /secret_logger {
            perl  logger::handler;
        }

        # Main location
        location / {
            add_before_body  /secret_logger;        

            proxy_pass         http://127.0.0.1:8080/;
            proxy_redirect     default;

            proxy_set_header   Host             $host;
            proxy_set_header   X-Real-IP        $remote_addr;
            proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;

            client_max_body_size       10m;
            client_body_buffer_size    128k;

            proxy_connect_timeout      5;
            proxy_send_timeout         20;
            proxy_read_timeout         90;

            proxy_buffer_size          4k;
            proxy_buffers              4 32k;
            proxy_busy_buffers_size    64k;
            proxy_temp_file_write_size 64k;
        }
    }
}