Treat upstream internal server errors as temporary failures (closes #336) #337
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Prior to this change, we were treating upstream internal server errors as permanent rejections. This change introduces a special case for internal server errors so that they'll be treated as temporary write failures (i.e. write futures will fail with an
ApnsServerException) instead of permanent rejections (i.e. a successful future with aPushNotificationResponsethat reportsisRejectedastrue).