[Bug] OPDS: 'Error Parsing Catalog feed...' when using Calibre-Web Server

[caslicco]

Describe the bug

I get an error saying Error parsing Catalog feed. Please check the URL and try again. I am unable to find a way to get more specific details about the error.
I have tried accessing the Catalog from Calibre-Web using the "Moon+ Reader", and I am able to access the catalog and books. So I have concluded that the issue arises only when using Readium.
Also, I tried adding the 'Elephant Editions' Catalog (https://www.elephanteditions.net/opds), which works. I have compared the .atom files from 'Calibre-Web' and 'Elephant Editions' and noticed no difference.

How to reproduce?

1. Add a new OPDS Catalog in Readium with the URL: http://3.111.169.159:5000/opds, where you can access a sample catalog of 4 books through the Calibre-Web server.
2. Try adding the same catalog in 'Moon+ Reader' to verify that the catalog is indeed working.

Readium version

4.8.0

Android API version

31

Additional context

PS: I hope Readium supports 'authenticated access' to OPDS feeds, i.e., a way to access the catalog using a user's Login credentials.
Ideally, the Calibre-Web server requires the user to input login credentials to access the catalog; a requirement I have disabled for testing purposes.

[mickael-menu]

Could you share the content of the OPDS feed that is not being parsed? Thanks.

[caslicco]

Hi, thanks for responding. I have attached the opds.atom feed as a text file as well as the Calibre Library of the 4 .epub books.

TestLibrary.zip

[opds.atom From Calibre Web].txt