Fix Mixed SSL Images on Wordpress - Kingsumo Fix

This technique was first used

on https://jeffgordon.com/giveaways/autographed-jeff-gordon-die-cast-contest-giveaway-4/ 

When to use

The KingSumo app requires all images to be served over SSL. For some reason, the KingSumo pages serve all of the images except for the background image as SSL. It's probably due to most are HTML and background  is CSS.

The solution

Open WP Engine > General Settings and scroll down to the HTML Post-Processing section. Add the following code, but change the URL from jeffgordon.com to the site URL.

#http://jeffgordon.com/wp-content/uploads# => https://jeffgordon.com/wp-content/uploads