Limit request + whitelist = not using response code from backend? 0.8.54

[DreamWerx]

Hi all,

I'm hoping someone can help me with a small issue.  I'm trying to
implement rate limiting with a whitelist, and all in all it seems to
be working, but
the wrong response code is being sent back to the browser.

For example if the apache backend sends a 302 redirect response, nginx
still sends a 200 back?  If I remove the mapping to code 200, it then
sends a 418 back.
Is there an easy fix for this?

Here is my config.  Thanks for any help.

---------

http {
  recursive_error_pages on;
  proxy_buffering off;

  geo $limited {
    default         1;
    10.0.0.0/8      0;
    xxx.xxx.xxx.xx  0;
  }

  limit_req_zone $binary_remote_addr zone=protect1:10m rate=5r/s;
}


location / {
  error_page 418 =200 @limitclient;
  #error_page 418 @limitclient;
  if ($limited) {
    return 418;
  }

  proxy_read_timeout 300;
  default_type text/html;
  charset utf-8;
  proxy_set_header Host $http_host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_redirect off;
  proxy_pass        http://backend;
}

location @limitclient {
  error_page 503 @flooder;
  limit_req zone=protect1 burst=5 nodelay;

  proxy_read_timeout 300;
  default_type text/html;
  charset utf-8;
  proxy_set_header Host $http_host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_redirect off;
  proxy_pass        http://backend;
}

location @flooder {
  rewrite ^(.*)$   /flooder.html break;
}