These tests have been flaky, and in general it was probably unwise to
try to rely on an external site like this. I was unable to determine
exactly why the test is failing. The page loads, and then puppeteer
throws an error.
I don't know if it is really feasible to bring these back in some form.
It's probably more effort than it is worth.
Closes https://github.com/rust-lang/mdBook/issues/2765
This adds the ability to redirect URLs with `#` fragments. This is
useful when section headers get renamed or moved to other pages.
This works both for deleted pages and existing pages.
The implementation requires the use of JavaScript in order to manipulate
the location. (Ideally this would be handled on the server side.)
This also makes it so that deleted page redirects preserve the fragment
ID. Previously if you had a deleted page redirect, and the user went to
something like `page.html#foo`, it would redirect to `bar.html` without
the fragment. I think preserving the fragment is probably a better
behavior. If the new page doesn't have the fragment ID, then no harm is
really done. This is technically an open redirect, but I don't think
that there is too much danger with preserving a fragment ID?
