Re-posting this as my previous reply was incomplete, and I am not allowed to edit. If anyone can delete the previous reply I'd appreciate it.
I did some more extensive testing while I was at work (my server is accessible outside my network).
Here are the results of each test:
1.) Windows 7 desktop - wired - Chrome web browser - no issues
2.) Windows 7 laptop - Wi-Fi - Chrome web bowser - no issues
3.) Galaxy Note 8 - Wi-Fi - Chrome (Android) web browser - comics fail to download
4.) Galaxy Note 8 - Wi-Fi - Edge (Android) web browser - comics fail to download
5.) Galaxy Note 8 - Wi-Fi - Firefox (Android) web browser - no issues
6.) Kindle Fire HD 10 (2019) - Chrome (Android) web browser - comics fail to download
7.) Kindle Fire HD 10 (2019) - Silk (Android) web browser - comics fail to download
8.) Kindle Fire HD 10 (2019) - Firefox (Android) web browser - no issues
So it seems the common factor is Chromium-based browsers on Android devices. I don't have any iOS devices so I'm unable to test other platforms.
Using Firefox is a 100% viable workaround, but I'm curious as to the cause, maybe there is a browser setting that can be adjusted? I will update this if I discover anything further.
For anyone wanted to reproduce:
1.) Add .cbz or .cbr files to your Calibre web server
2.) Try to download the files from an Android device using a Chromium-based web browser (Chrome, Edge, Silk)
3.) Most of the time the download will fail with a "network error" message. Larger file sizes will fail more frequently
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