NGINX - How to redirect on 504 gateway timeout - nginx

Question

I'm using NGINX as a reverse proxy to a glassfish. When the glassfish returns 50x errors, I'm able to identify and redirect to another resource from a cdn.
But if it simply times out, NGINX will respond to the user with 504 gateway timeout instead of redirecting to a good resource at the CDN through rewrite.
I'd like to do the same thing in this case, if NGINX times out, I want to redirect to another URL, the same way I do in #redir_404 .
How can I achieve that?
Thank you.
server {
listen *:80;
ssl off;
access_log /var/log/nginx/access-.log;
error_log /var/log/nginx/error-.log;
client_max_body_size 60m;
location #redir_404 {
rewrite /ad/(.*?)(\?.*)?$ $scheme://cdn.company.com/ad/$1/index.html break;
rewrite /tag(.*?)$ $scheme://cdn.company.com/tag/pixel.png break;
}
location / {
proxy_intercept_errors on;
set_real_ip_from 192.23.45.16;
real_ip_recursive on;
real_ip_header X-Forwarded-For;
proxy_pass http://localhost:8080;
# Force timeouts if one of the backend is dead #
proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
# Set headers #
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Umotion-Ip $remote_addr;
proxy_set_header User-Agent $http_user_agent;
add_header Front-End-Https on;
# By default we don't want to redirect #
proxy_redirect off;
# Force cache-control to no-cache for /tag and /ad
location ~ ^/(tag|ad) {
proxy_pass http://localhost:8080;
add_header Cache-Control "private, no-cache, no-store, must-revalidate, proxy-revalidate";
}
error_page 403 404 405 500 501 502 503 504 = #redir_404;
}
}

Answer 1

Add error_page location to redirect within your server block.
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
internal;
}
We can customise the error pages as required(/50x.html is cutom designed page)