I noticed it earlier today, I haven’t changed anything on my website for a couple of days.
-turned off all the plugins
-switched the theme
-restored to earlier backup (databases and all)
-loaded clean .htaccess ( RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301])
-reverted to earlier WP 5.3.3
-tried to publish the new page only to get: “Publishing failed. The response is not a valid JSON response”
-contacted the web-host, they claim that everything is fine on their side (my other website on the same web-host account
works fine)
The REST API is one way WordPress, and other applications, communicate with the server. One example is the block editor screen, which relies on this to display, and save, your posts and pages.
The REST API call gave the following unexpected result: (404)