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John, I don't remember the details of what you were looking to do, nor do I know what options you have for your kiosk. If you have the option to use the Pale Moon browser (https://www.palemoon.org/), then you might get what you want with the FiErr extension (https://realityripple.com/Software/XUL/Fierr/) Erich On Wednesday, March 27, 2024 at 11:24, John Lolis eloquently inscribed: > I thought I'd provide an update on my attempts at having a custom error > page returned at an OPAC. > > I started looking into hacking the error pages in Firefox itself > (thanks, Kaleb!), but due to code-signing requirements, it seemed like a > rabbit hole I'd want to avoid, at least for now (even though Easter is > upon us :-). So I set up a Squid proxy server with the necessary > network restrictions and a custom error page as previously reported, and > I thought I nailed it until I found that this only works for HTTP > requests. If it's HTTPS, the browser returns its own error. This > behavior is apparently ubiquitous with all browsers according to what I > found. Here's the most exhaustive posting I've found on the subject: > https://squid-users.squid-cache.narkive.com/527KMD5K/squid-custom- > error-page > > I don't suppose there's an extension that forces HTTP instead of HTTPS. So > far I've found plenty that will rewrite a URL, but they only rewrite the > address portion, and not the protocol. > > John Lolis > Coordinator of Computer Systems > > 100 Martine Avenue > White Plains, NY 10601 > tel: 1.914.422.1497 > fax: 1.914.422.1452 > > https://whiteplainslibrary.org/ > *“I would rather have questions that can’t be answered than answers that can’t be questioned.”* — Richard Feynman <https://click.fourhourmail.com/5qure95xkf7hvvo93wh2/7qh7h8h05vr4zrtz/ aHR0cHM6Ly9lbi53aWtpcGVkaWEub3JnL3dpa2kvUmljaGFyZF9GZXlubWFu>, theoretical physicist and recipient of the Nobel Prize in Physics in 1965