This would include all of the information current present in the Headers pane of the Network tab.
<rdar://problem/21693696>
Created attachment 361139 [details] Patch
Comment on attachment 361139 [details] Patch What is the use case for this?
Comment on attachment 361139 [details] Patch r=me
Comment on attachment 361139 [details] Patch Clearing flags on attachment: 361139 Committed r241279: <https://trac.webkit.org/changeset/241279>
All reviewed patches have been landed. Closing bug.