问题
I have a single-page static app hosted at example.com. My server for the app is hosted at server.com. I keep these two services completely separate and they can scale differently this way. When the user wants to login their username and password is passed to yoyoma.com and a cookie is set on server.com with the access_token. The user is then redirected to example.com and is now logged in.
From the static app at example.com, we can now make AJAX requests to server.com setting withCredentials=true so that the access_token we set is passed along to server.com. This works perfectly in every browser but Safari. The only way I've gotten Safari to work is by going to preferences -> privacy -> disabling "Prevent cross-site tracking". I know that the cookies are getting set on server.com, but they don't get passed with the AJAX request. It seems to be some Privacy feature that Apple thinks is just wonderful, but how are you supposed to get around this issue. I'm not an ad service, I'm not doing anything evil, just trying to get my app to work. I specifically want to build a single page app where the server is on a different domain. Is this possible in Safari or has their privacy setting made this impossible?
Note: I should also mention to security fanatics that when the access_token cookie is set, the user is then redirected to example.com with a CSRF token. This csrf token is passed in every AJAX request by a header to prevent Cross Site Request Forgery.
来源：https://stackoverflow.com/questions/54225687/ajax-withcredentials-not-passing-along-cookies-in-safari