No Stupid Questions
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Thanks, your answer makes sense. Changing the regex so it does not need the '.' will lead to undesirable behaviour as links with hashes in them could randomly contain something like 'png'. Adding individual support for sites (like Twitter) might be a bad idea as it complicates things.
Interestingly, this Pixiv link ends on '.jpg' yet doesn't work still: https://i.pximg.net/img-master/img/2020/05/28/00/00/23/81902983_p0_master1200.jpg (src: https://www.pixiv.net/en/artworks/81902983) They might have some extra protection.
Pixiv does not allow direct linking to images as it uses an authentication token to fetch images, and this token is only sent if you view the image from the
pixiv.netsite. They don't have a "no token required reduced size preview" version of the image that is used to generate thumbnails. What @iraldir saw the second time is probably a cached version of the image as it always returns 403 when I requesti.pximg.netdirectly.I got a 403 the first time I visited it, then when I went to the source, and back to the image it works. I suspect they have a cookie or something to detect that you're a valid user.
Because this is a different domain the cookie would not come with the image request.
Just a wild guess