Here is the link (after being changed to https):
https://ws.assoc-amazon.com/widgets/q?_encoding=UTF8&Format=_SL110_&ASIN=1592406521&MarketPlace=US&ID=AsinImage&WS=1&tag=gift0b4d-20&ServiceVersion=20070822
Remove the S on the HTTPS to see that it redirects to an image. Firefox doesn’t seem to attempt to connect at all as it sees an insecure security certificate and blocks it, so I suppose it might not be throwing a 404 specifically.
