After setting up an Amazon Elastic Load Balancer, where SSL terminates, I was getting Mixed Content errors on the site, until I added the following line to wp-config.php.

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

While this fixed the Mixed Content errors, now I get this PHP Notice after using wp-cli:

PHP Notice:  Undefined index: HTTP_X_FORWARDED_PROTO in phar:///opt/bitnami/apps/wordpress/bin/wp-cli.phar/vendor/wp-cli/wp-cli/php/WP_CLI/Runner.php(1169) : eval()'d code on line 81

What should I do?

1 Answer 1


Check if isset() first. It will not always be set (that is what the undefined index is referring to):

I took this from user temuraru

$isSecure = false;
if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
    $isSecure = true;
    $isSecure = true;
$REQUEST_PROTOCOL = $isSecure ? 'https' : 'http';
  • Thanks, but unfortunately it's not working, as the mixed content errors return.
    – paradroid
    Commented Jul 24, 2019 at 9:38
  • I forgot to mention that I am also using Varnish, but this solution is supposed to work with that - stackoverflow.com/a/16076965/140872
    – paradroid
    Commented Jul 28, 2019 at 15:42

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