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If you embed the book under a https website, you need to use the book https url

You just need to modify the book url to https format:

For example,

1. Your flipbook’s http URL : http://online.pubhtml5.com/ylxu/fbsb/

You just need to change it to this format:

2. Your flipbook’s https URL : https://s3.amazonaws.com/ online.pubhtml5.com/ijua/bmqh/ index.html