解決 Chrome 顯示 This request has been blocked，因為 HTTPS

Mixed Content was loaded over HTTPS, 
but requested an insecure image This request has been blocked; 
the content must be served over HTTPS.

解決一 : 在程式裡加入

header("Content-Security-Policy: upgrade-insecure-requests");

解決二 : 在 apache config 裡加入

Header set Content-Security-Policy: upgrade-insecure-requests