Support for this header was removed from souphttpsrc in 2012, it seems... https://bugzilla.gnome.org/show_bug.cgi?id=676020
Created attachment 238068 [details] Patch
Created attachment 238070 [details] Patch
I'll let Phil review this but I guess we need some test to check the headers we send.
Comment on attachment 238070 [details] Patch Loooks good, thanks! I'm not really sure a test is needed for this though.
Comment on attachment 238070 [details] Patch Clearing flags on attachment: 238070 Committed r173614: <http://trac.webkit.org/changeset/173614>
All reviewed patches have been landed. Closing bug.