[CentOS] redirect

Hi,

I have an Nginx http proxy server with SSL. What I want to do is:

If a client that has a certificate is trying to access the server's 
address, he is to be redirected to our production server, to certain URL.
If a client doesn't have a certificate, he is to be redirected to the 
same production server, but a different URL.
The problem is that if the client doesn't have a certificate, he gets 
the following error:

 400 Bad Request

The SSL certificate error

------------------------------------------------------------------------
nginx/0.6.39





I've tried the following:

server {
    listen      8443;

    ssl                  on;
    ssl_certificate      /etc/httpd/ssl/proxy-ssl.cer;
    ssl_certificate_key  /etc/httpd/ssl/server.key;
    ssl_client_certificate /etc/httpd/ssl/ca-bundle.crt;
    ssl_verify_client       on
.............................................................................................
.............................................................................................

    error_page  400  /400.html;
        location =  /400.html {
        root  /usr/share/nginx/html;

but the error page 400 statement is simply ignored. Does anyone have an 
idea how can I do it ? I tried to find the 400 error page, thinking 
maybe I can make the redirect there, but it is simply not to be found.


P.S. my programming/scripting skills aren't any.....