Prevent React applications from 404 errors when refreshing the page on inner URLs

This code is an Apache web server configuration file written in Apache’s mod_rewrite syntax. It’s commonly used in React applications to prevent 404 errors when refreshing the page on inner URLs.

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\\.html$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l
RewriteRule . /index.html [L]
</IfModule>

In summary, this code tells Apache to rewrite all requests that aren’t for an existing file, directory or symbolic link to the “/index.html” file. This allows the React application to handle the request and render the appropriate component, instead of returning a 404 error.