Fix for issue #16 #18
                
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Hi there,
I've fixed Issue#16.
If an Accept header is provided for document downloads, it will now be used; otherwise, it defaults to application/json.
I also migrated the existing tests to JUnit 5 and added new tests for this issue using WireMock.
Unfortunately, I wasn’t able to run the existing unit tests due to a missing .env file for Dotenv.
If possible, it would be great if you could add that file to the project.
Thanks!