转载 Mixed Content Page
网站配置了https之后，网页上的百度地图无法正常显示，报错类似于：
Mixed Content: The page at 'https://url_1' was loaded over HTTPS,
but requested an insecure script 'http://monitor_analytic.js'.
This request has been blocked; the content must be served over HTTPS.
原因可能是：
1. HTTPS页面里动态的引入HTTP资源，比如引入一个js文件，会被直接block掉的 2. 在HTTPS页面里通过AJAX的方式请求HTTP资源，也会被直接block掉的。
提出的解决办法：
方法1：相对协议。
对于同时支持HTTPS和HTTP的资源，引用的时候要把引用资源的URL里的协议头去掉，
浏览器会自动根据当前是HTTPS还是HTTP来给资源URL补上协议头的，可以达到无缝切换。
下面是回答中有人给出的解决办法：http://thehackernews.com
The search engine giant recommended you to enable it via an HTTP response header, "Content-Security-Policy: upgrade-insecure-requests," if all the content is controlled by you. However, if the unsecure resources are served from a web server you don’t control, you can include the <meta http-equiv="Content-Security-Policy" content="upgrade-insecure-requests"> tag in your page's <head>.
对于https协议下访问http的图片链接，chrome浏览器并没有block，而是提出了警告。但是并不是所有手机的webkit浏览器都支持这样的警告，很多手机可能还是会直接block，造成图片没有办法显示
总结：对于mixed content page that the connection is only partially encrypted. 为了在http转https的过程中顺利过渡，mixed content page页面是非常糟糕的选择。
