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How to avoid insecure content warning in browser?

When both HTTP and HTTPS content are being loaded on a webpage over a secure HTTPS connection, browser will display warning about this type of mixed content to indicate to user that this page contains insecure resources.

Browser showing insecure warning through HTTPS connection Browser showing secure content through HTTPS connection

To ensure the webpage content is secure through HTTPS connection, please use relative path in resources (include images, video, scripts).
For example, the absolute path "http://www.its.hku.hk" should be excluded from image source under the website:

Recommended to use relative path


<img src="/images/abc.jpg" >
 

Not recommended to use absolute path


<img src="http://www.its.hku.hk/images/abc.jpg" >
 

 

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