Nginx HTTP Server - Fourth Edition

error_page

Context: http, server, location, and if. Variables are accepted.

Allows you to affect URIs to HTTP response code and optionally to replace the code with another.

Syntax: error_page code1 [code2...] [=replacement code] [=@block | URI]

Where the replacement code (denoted by =code) is one of 301, 302, 303, 307, or 308

Examples :

error_page 404 /not_found.html; 
error_page 500 501 502 503 504 /server_error.html; 
error_page 403 http://website.com/; 
error_page 404 @notfound; # jump to a named location block 
error_page 404 =200 /index.html; # in case of 404 error, redirect to index.html with a 200 OK response code