Yeah, i'm dealing with CORS issue with Safari right now. On a XHR with a custom header over https, safari fails with a "protocol error" error rather than runnin

Yeah, i'm dealing with CORS issue with Safari right now. On a XHR with a custom header over https, safari fails with a "protocol error" error rather than running the pre-flight request. The same query without the custom header works well. Every other browser (IE, Edge, Chrome, Firefox) handle it well and does the OPTIONS call to ensure I allow this header. If anybody has a solution for that, I'm all ears :)