Whilst recently converting a WordPress site from http to https I hit a problem where no matter what I did, the site would result in a redirect loop causing the page to fail.

The website in question was fronted by Cloud Flare CDN.

Turns out there’s a quick solution!   Add the following code snippet to your wp.config file:

 

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

    $_SERVER['HTTPS']='on';