Safari not sending cookie even after setting SameSite=None; Secure

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Versions of Safari on MacOS 10.14 and all browsers on iOS 12 are affected by this bug which means that SameSite=None is erroneously treated as SameSite=Strict, e.g. the most restrictive setting.

I’ve published some guidance in SameSite cookie recipes on either:

  • Using two sets of cookies to account for browsers that support SameSite=None; Secure and those that don’t.
  • Sniffing the user agent for incompatible browsers and not serving SameSite=None for those requests.

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