Open http://httpbin.org/cookies/set?k1=v1&k2=v2 - this will set cookies, redirect, then echo the cookies sent by the browser. Open web inspector network panel, refresh the page, and inspect the page request. Although cookies are sent, they aren't shown as part of the request headers.
Created attachment 307491 [details] [IMAGE] Cookie Request Headers - STP 28 In Safari Technology Preview 28 on Sierra I see Cookies in the Request. Can you clarify which version of the browser you are using and on what system?
Haha yes. This was an issue in 27, but is fixed in 28. Well done everyone, very efficient :D