Quote from Asgaros on May 29, 2019, 1:03 pm

@rusev Can you give me some advanved permissions on your WordPress-site for the account so I can check some settings?

Quote from RUSev on May 29, 2019, 1:05 pm

ОК!

Quote from Asgaros on May 29, 2019, 1:40 pm

I dont know, there seems to be something seriously wrong. WordPress has a built-in Site Health tool which can be used to check the basic configuration of WordPress. This is accessible via this URL:

https://kam-news.ru/wp-admin/site-health.php

But this site doesnt load and it shows some components of some other plugins instead:

• A counter on the top-left
• Some kind of chat in the bottom

I dont know which plugins are adding this comment but can you try to disable them to check if the Site Health tool can get executed after it? Without, its impossible for me to verify if the REST-endpoint is working correctly or not.

Quote from RUSev on May 29, 2019, 3:43 pm

@asgaros

Counter removed. Page Site Health opens

Quote from Asgaros on May 29, 2019, 4:03 pm

@rusev Thanks. I will check it again later or tomorrow as soon as I am back home and will give you feedback.

Quote from RUSev on May 30, 2019, 1:23 pm

Hi @adnan

What is your website?

Same problem?
Drop the link.

Quote from Asgaros on May 30, 2019, 3:37 pm

Hello @rusev

Have you changed something at your plugins? I can currently not reach your site because it throws an error.

Quote from RUSev on May 30, 2019, 4:12 pm

Hi @asgaros

Fixed

Quote from Asgaros on May 30, 2019, 4:23 pm

@rusev

One thing I figured out is that your theme disabled a lot of required REST-functionalities:

// Отключаем  REST API
add_filter('rest_enabled', '__return_false');

// Отключаем фильтры REST API
remove_action( 'xmlrpc_rsd_apis',            'rest_output_rsd' );
remove_action( 'wp_head',                    'rest_output_link_wp_head', 10, 0 );
remove_action( 'template_redirect',          'rest_output_link_header', 11, 0 );
remove_action( 'auth_cookie_malformed',      'rest_cookie_collect_status' );
remove_action( 'auth_cookie_expired',        'rest_cookie_collect_status' );
remove_action( 'auth_cookie_bad_username',   'rest_cookie_collect_status' );
remove_action( 'auth_cookie_bad_hash',       'rest_cookie_collect_status' );
remove_action( 'auth_cookie_valid',          'rest_cookie_collect_status' );
remove_filter( 'rest_authentication_errors', 'rest_cookie_check_errors', 100 );

// Отключаем события REST API
remove_action( 'init',        'rest_api_init' );
remove_action( 'rest_api_init', 'rest_api_default_filters', 10, 1 );
remove_action( 'parse_request', 'rest_api_loaded' );

// Отключаем Embeds связанные с REST API
remove_action( 'rest_api_init',     'wp_oembed_register_route'              );
remove_filter( 'rest_pre_serve_request', '_oembed_rest_pre_serve_request', 10, 4 );

Putting this code into comments does not fix the problem unfortunately but I guess that it is caused by some of the theme-functionality. Is it possible for you to contact the theme-developers to check out if there are any known issues regarding their theme and REST-functionality?