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rlib
Asked: 2015-12-25 08:36:32 +0800 CST

How to pass headers to remote error handler in Nginx

  • 772

I have nginx server that sends 404 errors to apache httpd at 1.1.1.1:8081. How can I pass all original headers to the error server?

I have the following config:

server {
   error_page 404 = http://1.1.1.1:8081/404.php?remote=1;
}

When examining headers in 404.php I get client original ip but no cookies from the client; also, I get request uri set to 404.php?remote=1 and not url that caused the 404 error:

<?php
  // 404.php file
  file_put_content("log.txt", $_SERVER['REQUEST_URI'], FILE_APPEND); // :(
  file_put_content("log.txt", $_SERVER['REMOTE_ADDR'], FILE_APPEND); // Ok
  file_put_content("log.txt", $_COOKIE['MyCookie'], FILE_APPEND); // :( empty
?>
nginx

1 Answers

  1. Best Answer

    It isn't pretty, but one possible solution is to use a named location with a proxy pass to your error handler and then add as many custom headers as you need with the desired information. It means customising the 404.php file also.

    For example:

    error_page 404 = @handler;

location @handler {
    rewrite ^ /404.php?remote=1? break;
    proxy_set_header X-Request $request_uri;
    proxy_set_header X-Remote $remote_addr;
    proxy_set_header X-Cookie $cookie_some_cookie_name;
    proxy_pass http://1.1.1.1:8081;
}
    • 1