This request has been blocked; the content must be served over HTTPS

在 HTTPS 承載的頁面上不允許出現 http 請求，一旦出現就是提示或報錯：
This request has been blocked; the content must be served over HTTPS

解決方案：

html：
<meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests"/>

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

nginx:在server模塊增加
add_header Content-Security-Policy "upgrade-insecure-requests;connect-src *";