WP Engine html post processing rule force CDN to HTTPS
#https?://(www.)?(MyDomain.com|MyInstall.wpengine.com|MyCDNcrazyness1234567890(.wpengine|-wpengine).netdna-(ssl|cdn).com)/(wp-content|wp-includes)# => https://MyCDNcrazyness1234567890-wpengine.netdna-ssl.com/$5