There are numbers of HTTP RSS links that no longer works, and no HTTPS alternative is available. These link should be removed from the subscription list.
<rdar://problem/102446034>
Pull request: https://github.com/WebKit/WebKit/pull/6576
Committed 256794@main (78d69e2da2f1): <https://commits.webkit.org/256794@main> Reviewed commits have been landed. Closing PR #6576 and removing active labels.