Requested feature overview description.
Add https://*.archive.org/ to upload whitelist. In the case that the Internet Archive's whole website being added is unsuitable, *.archive.org can be restricted to certain content by replacing the * with "web", (just the wayback machine) and/or "us" (a base URL images and media from the Internet Archive's other collections are hosted at).

Why would it be useful?
Allows content from archive.org to be posted to e621 by pasting a link to it in the form on the upload page. Examples of relevant content in IA's other collections include this and this . The Wayback Machine also hosts relevant content that includes images on artist websites which have since gone down (e.g. Biohazards art site ) and art posted on other furry websites but lost due to error (e.g. art on the now-offline vclwiki , and FA submissions lost due to various errors , etc.)

What part(s) of the site page(s) are affected?
upload page , upload whitelist

We have a specific thread for whitelist requests (topic #22269). It would be better to make this request there instead of making an entirely new thread.

This runs into open proxy types of issues. That would effectively bypass the non-allowed domains. Probably better to parse the "https://web.archive.org/web/*/" part out and treat it as if rest was the actual link for 'allowed' status. This would also mean it's a good idea to remove the specific date/timestamp out and replace them with a star (*) like above double-quoted string does. This would conveniently link to list of different revisions, if any. But then you couldn't link to specific versions, so maybe just have regex to ignore the timestamp, and not autoreplace it with *?