I am new to Information Security. I can find many websites asking to verify the checksum of the files. It's logical if the file is exposed to modification while transmission. HTTPS addresses this issue and guarantees the integrity of the file.
According to this article by IBM,
SSL provides data integrity by calculating a message digest
So, again, what's the reason behind verification of the digest of a file served over HTTPS?
Assume that no mirror server is involved.