We should validate proxy URLs passed to WebKitNetworkProxySettings. This helps with https://gitlab.gnome.org/GNOME/glib/-/issues/2597
Pull request: https://github.com/WebKit/WebKit/pull/1429
Committed r295454 (251460@main): <https://commits.webkit.org/251460@main> Reviewed commits have been landed. Closing PR #1429 and removing active labels.