How to solve the problem of WordPress being unable to access the backend after using Cloudflare CDN

Many people are unable to access the backend of WordPress after using Cloudflare CDN, mainly because of the use of Cloudflare's SSL. I tried several methods at night, but none of them worked. The following solution is safe, simple and convenient.

To solve this problem, Cloudflare released a WordPress plug-in: Cloudflare Flexible SSL, which specifically solves this problem.

1. Download the plug-in to the plugins directory and unzip it

Plugin download: https://wordpress.org/plugins/Cloudflare-flexible-ssl/

2. Enter the MySQL database, in the wp_options table, edit active_plugins in option_name (for activated plugins). Our method is to add Cloudflare Flexible SSL to it, which enables this plug-in.

The option_value field:

 a:2:{i:0;s:33:"classic-editor/classic-editor.php";i:1;s:34:"cloudflare-flexible-ssl/plugin.php";}

Add to

 i:1;s:34:"cloudflare-flexible-ssl/plugin.php";

At the same time, the number at the beginning of a:2 is the number of enabled plug-ins, so remember to modify it.