Accessing Overseerr via HTTPS results in errors

[ano0002]

Thank you, @ano0002, for your hard work. I've found another bug: accessing Overseerr via HTTPS results in the following error:

[blocked] The page at https://overseerr.domain.com/ requested insecure content from http://IP:PORT/MediaCover/396/poster.jpg?lastWrite=ID. This content was blocked and must be served over HTTPS.

However, it works relatively fine when accessed via HTTP. Specifically, the artist posters are displayed correctly using HTTP when an artist page is opened but not on the music page.

Originally posted by @huzama in sct#3800 (comment)