2021-04-22 File extension in upper case - is this to be expected or a one-time issue?

[oliveratgithub]

First noticed with the APOD from April 22, 2021: the APOD's file extension is all upper case (.JPG): https://apod.nasa.gov/apod/image/2104/ISS002-E-7377c.JPG

Is this to be an expected behaviour, also for other APOD images (in the future)? Or is this an issue with this individual provisioned APOD image file?

Asking because my case-sensitive apache2 complained about this one image - whereas this has not happened on any images within the last couple of months or even years, to my knowledge. Wondering if I should update my code, or if it should be given that the APOD usually is continued to be provided in all lowercase.

[oliveratgithub]

Received a feedback on the procedure of how images are added to APOD and how it affects file names and extensions:

Chris Peterson wrote:
As a rule, the image on the main page for an APOD is modified by the editors, and the click-through image is as provided by its author, including its filename. You should be able to support any valid filename, with any valid characters and any mix of case.