This is a pretty easy repro:
- Navigate to the reader for any chapter with 3 or more pages
- Set the reader's page display mode to "two pages when possible"
- Advance to a non-cover page, so that the URL ends in e.g. "/2-3" instead of "/1"
- Refresh the page
You'll get a 404 instead of actually loading the reader. This can be worked around by removing the dash and second page number from the URL, but it's kinda annoying. Example: https://www.fakku.net/hentai/hentai-manga-a-brief-history-of-pornographic-comics-in-japan-english/read/page/2-3
Seems like a routing issue on the server; I'm guessing there's a regex or equivalent somewhere that matches something like
.../read/page/\[0-9\]+
, and it should match
.../read/page/\[0-9\]+(-?:\[0-9\]+)?
. Alternately, the reader could just set the URL to the first of the 2 page numbers instead of including both.