The below are reporting Internal Server Error might be more in the mix too http/tests/websocket/tests/hybi/websocket-allowed-setting-cookie-as-third-party.html http/tests/websocket/tests/hybi/websocket-blocked-from-setting-cookie-as-third-party.html http/tests/websocket/tests/hybi/websocket-cookie-overwrite-behavior.html
I don't see such problem both for WinCairo WK1/WK2. Did you configure the registry? https://trac.webkit.org/wiki/BuildingCairoOnWindows
https://results.webkit.org/?suite=layout-tests&suite=layout-tests&suite=layout-tests&test=http%2Ftests%2Fwebsocket%2Ftests%2Fhybi%2Fwebsocket-allowed-setting-cookie-as-third-party.html&test=http%2Ftests%2Fwebsocket%2Ftests%2Fhybi%2Fwebsocket-blocked-from-setting-cookie-as-third-party.html&test=http%2Ftests%2Fwebsocket%2Ftests%2Fhybi%2Fwebsocket-cookie-overwrite-behavior.html&platform=wincairo&platform=win
<rdar://problem/90439303>