I'm not quite sure what you are looking for, but I was able to get this to work just like a demo. Although you may not want to use this example for your project, you can use the working code as a starting point for your own requirements.
For a simple test, you can simply clone the project somewhere under the web server into a directory, such as myproject, and visit http://yourservername.com/myproject/web/viewer.html . You will see how pdf appears. This could be the starting point for working with this project. I did this by starting a very simple Apache server on Linux.
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