'How to handle https content into ABCPDF while converting HTML to PDF

I am using professional license of abcpdf v9, I am using abcpdf for converting html to pdf into our ASP.net website. My html images, please see the below sample html of dev server

<html>
 <body>

  <img src="http://cdn.differencebetween.net/wp-content/uploads/2012/01/Difference-Between-Example-and-Sample-1.jpg" alt="some_text"></img>
 </body>
</html>

this html converted to pdf perfectly with imges and css applied to pdf.

But when it is on QA and production server html is getting converted into pdf , but css is not getting applied to pdf and images are not shown in pdf. Below is sample html of QA server

<html>
 <body>

  <img src="https://previews.123rf.com/images/aquir/aquir1311/aquir131100316/23569861-sample-grunge-red-round-stamp.jpg" alt="some_text"></img>
 </body>
</html>

the difference is just QA server url is HTTPS:// and dev serve url id HTTP://. When I copy and paste this "https://previews.123rf.com/images/aquir/aquir1311/aquir131100316/23569861-sample-grunge-red-round-stamp.jpg" url into browser it shows image. Means images are public. So please help me out how could I resolved this issue related with https.

I have just used a simple HTML to PDF export code for ABCpdf9, nothing much. Package for reference: https://www.nuget.org/packages/ABCpdf/



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