Tutorial on configuring Error 404 page in nginx

What is the 404 page?
If a problem occurs on the website or the user attempts to access a page that does not exist, the Server Returns Error Code 404. The corresponding page is the 404 page.
The default content of the 404 page is related to the specific server. If the NGINX server is used in the background, the content of the 404 page may be:
404 Not Found
Nginx/0.8.6

Why do we need to customize the 404 page?
When I encounter the above 404 error page, I think 99% (uninvestigated, estimated data) users will close the page, and users will be quietly lost. If there is a beautiful page that can guide the user to where he wants to go, the user will inevitably be retained. Therefore, each website should customize its 404 page.

How to customize the 404 page in NGINX
There have been a lot of articles about the experience of customizing the 404 page under IIS and APACHE, and NGINX is still relatively small. Coincidentally, some of my servers are NGINX, in order to solve the problem of self-owned companies, we have made in-depth research on this issue. The research results show that it is feasible to configure a custom 404 page in NGINX, and it is very simple, just a few steps:

1.create the secret 404.html page

2. Change nginx. conf and add it to the http definition area:

fastcgi_intercept_errors on;

error_page 404 = /404.html

/opt/nginx/sbin/nginx –t

1. You must add: fastcgi_intercept_errors on. If this token is not set, creating 404.html and configuring error_page does not work.
Fastcgi_intercept_errors Syntax: fastcgi_intercept_errors on | off default: fastcgi_intercept_errors off add location: http, server, location by default, nginx does not support custom 404 error page, only this command is set to on, nginx supports 404 error redirection. Note that if fastcgi_intercept_errors on is set, nginx will redirect the 404 error. In nginx, the precondition for 404 error redirection to take effect is that fastcgi_intercept_errors on is set, and the error_page option is set correctly (including syntax and corresponding 404 page)

2. Do not set the homepage as the 404 error page for the purpose of saving time or increasing the homepage weight, or use other methods to jump to the homepage.

3. The custom 404 page must be larger than 512 bytes; otherwise, the default 404 page of IE may appear. For example, the parameter is set to 404.html and the size is only 11 bytes (the content is 404 error ). Use the following two addresses that do not exist for access:
Q: Where can I store the created 404 page?
I haven't tried it yet

Error_page 404 =/404.html;

Error_page 404 =/404.html;

That is to say, each sub-site copies a 404 file. Can this be the case?
Error_page 404 = ../404.html;
Only put a set of 404 under htdocs
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