Logging POST data from $request_body and returning 200

[barretto_chris]

I am able to log POST data correctly with the following code:

location /bk {
  if ($request_method != POST) {
    return 405;
  }
  proxy_pass $scheme://127.0.0.1:$server_port/dummy;
  log_format my_tracking $request_body;
  access_log  /mnt/logs/nginx/my.access.log my_tracking;
}
location /dummy { set $test 0; }

but the requester gets a 404 return code. I'd like to return a 200 but
when I make the following change:

location /bk {
  if ($request_method != POST) {
    return 405;
  }
  proxy_pass $scheme://127.0.0.1:$server_port/dummy;
  log_format my_tracking $request_body;
  access_log  /mnt/logs/nginx/my.access.log my_tracking;
  return 200;
}
location /dummy { set $test 0; }

The logs are recording blank data. Any ideas on record the data with
returning a 200?

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,178228,178228#msg-178228