Nginx – http redirect and append client IP as URL query

haproxynginxquerystringredirect

i have this weird issue which we need as a workaoround for an internal application limitation.

this is what I need, either from haproxy or nginx:

something calls http://my-server/?some=query_string
the server should respond with a redirect (http 301/302) to this location: http://my-other-server/?some=query_string?client_ip=ACTUAL_CLIENT_IP

could somebody provide an idea about how this might work? or even better still – the DNS reverse lookup name for the client IP?

thanks in advance!
axel.

Best Answer

You could try this:

location / {
    return 301 http://my-other-server/?client_ip=$remote_addr&$args;
}

This will assign the IP address. https://github.com/flant/nginx-http-rdns is a reverse DNS lookup module for nginx, which provides $rdns_hostname variable, which you can use instead of $remote_addr. However, you need to compile the module to your nginx to use it.

Related Solutions

Nginx – Do not expose HTTP 302 redirect by HTTP reverse proxy – handle it internally

You should consider the proxy_redirect directive which might help you dealing with this problem.

NGINX Reverse Proxy – URL Rewrite

Any redirect to localhost doesn't make sense from a remote system (e.g. client's Web browser). So the rewrite flags permanent (301) or redirect (302) are not usable in your case.

Please try following setup using a transparent rewrite rule:

location  /foo {
  rewrite /foo/(.*) /$1  break;
  proxy_pass         http://localhost:3200;
  proxy_redirect     off;
  proxy_set_header   Host $host;
}

Use curl -i to test your rewrites. A very subtle change to the rule can cause nginx to perform a redirect.

Best Answer

Related Solutions

Nginx – Do not expose HTTP 302 redirect by HTTP reverse proxy – handle it internally

NGINX Reverse Proxy – URL Rewrite

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