Optional ReadonlyauthorizeConsent check run before every resolution. Absent means every request is allowed.
Optional ReadonlyhandoffOpens a URI with an app on the user's device. When given, downloads, sharing and
mail resolve by handing the locator off through it; without it they report unavailable.
Optional ReadonlyhttpPassed to the web bridge: policy overrides, fetch and host resolver.
Optional ReadonlyonObserver for every outcome, successful or not.
Optional ReadonlytorrentThe engine for magnet links, such as createWebTorrentBackend. It wins over the
hand-off for downloads from peers; the other bridges still hand off (D-017).
Options for createDefaultBridges.