This was missed during the previous implementation and was the reason
that the CSP tests weren't working.
It also updates a test to ensure that audio and video are not preloaded.
No browsers do that and with this fix, the test now passes in Chrome. In
Firefox it still fails as it doesn't implement `.vtt` support.
Part of #35035
Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>
The Link HTTP header can do the same as link elements,
in that they can preload/prefetch/etc... This implements
the basics of header parsing and hooks it up for preload.
Note that we use a new nom-rfc8288 crate that implements
the parsing behavior. However, that crate is too strict
in that empty attributes (;; as part of the header) are
discarded and resulting in a parsing failure. Therefore,
we use its lenient parsing mode.
Part of #35035
---------
Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>
Signed-off-by: Tim van der Lippe <TimvdLippe@users.noreply.github.com>
Co-authored-by: Josh Matthews <josh@joshmatthews.net>
