A ping request is a special network request. We should not support subclassing a ping handle because there are security/privacy implications with respect to redirect handling and including credentials/authentication with a ping request. Such aspects should not be changed or require careful consideration if changed. For completeness, the HTML ping attribute and corresponding ping request that should be created is described in section "Hyperlink auditing" in the HTML standard: <https://html.spec.whatwg.org/multipage/semantics.html#hyperlink-auditing>.
Created attachment 289861 [details] Patch
Comment on attachment 289861 [details] Patch Clearing flags on attachment: 289861 Committed r206396: <http://trac.webkit.org/changeset/206396>
All reviewed patches have been landed. Closing bug.