Resolved AH01071: Got error 'PHP message: PHP Warning: Undefined array key "HTTP_X_FORWARDED_PROTO"

[JMaartenW]

Server operating system version

Debian 10.13

Plesk version and microupdate number

Version 18.0.58 Update #2

Anyone know why i am getting this warning in the Plesk Logs, and how to resolve it?

AH01071: Got error 'PHP message: PHP Warning: Undefined array key "HTTP_X_FORWARDED_PROTO" in /var/www/vhosts/website-name/httpdocs/wp-config.php on line 7', referer: https://website-url/our-sitemap/

I have this line in the wp-config that appears to have started causing a problem

if (strpos($_SERVER['HTTP_X_FORWARDED_PROTO'], 'https') !== false)
$_SERVER['HTTPS']='on';

 

[Peter Debik]

Whatever that line shall do, you can eliminate the error by adding a test if the array element exists, e.g.

if ((isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) && (strpos($_SERVER['HTTP_X_FORWARDED_PROTO'], 'https') !== false))
$_SERVER['HTTPS']='on';

 

[JMaartenW]

Thanks - Good idea