I fixed the old bleachbooru parser for the new URL but the file pages always fail due to a connection refused error.
The gallery downloader properly downloads and parses the gallery. The parser test properly downloads and parses the file and gallery page. Downloading a direct image (e.g. bleachbooru.org/data/sample/59/83/59839fad73eca750f5c43dabdca1efca.jpg instead of bleachbooru.org/post/show/41663) works.
But it always fails when downloading the post pages through the URL and gallery downloader.
As it can properly download the gallery page, the image, and the tags separately I'm inclined to think it's a bug in hydrus.