Because the new serializer in Bug 222145 has uncovered some subtle differences between CFURLRequest and NSURLRequest serialization, introduce a temporary serialization step to pick up a few things not in the CoreFoundation object.
<rdar://problem/74562457>
Created attachment 421125 [details] Patch
Created attachment 421126 [details] Patch
Created attachment 421127 [details] Patch
Created attachment 421129 [details] Patch for landing
Committed r273216: <https://commits.webkit.org/r273216> All reviewed patches have been landed. Closing bug and clearing flags on attachment 421129 [details].