Custom methods for the 404 502 error page for Nginx

First open nginx.conf, fastcgi_temp_file_write_size 128k; Let's add

fastcgi_intercept_errors on; Note, including;
no.
Then add
to the site you want to define
error_page 404 = /404.htm;
For example:

 
server 
{ 
listen 80; 
server_name www.deepvps.com; 
index index.html index.htm index.php; 
error_page 404 = /404.htm; 
include location.conf; 
root /home/www/logs; 
} 

Remember that the 404 page is placed under the directory of the site...

Test configuration
/usr/local/nginx/sbin/nginx -t

Restart nginx
with no errors /etc/init.d/nginx restart

BTW, and other pages define
the same way
error_page 502 = /502.htm;