DNS and HTTPS: Diagnose an Unreachable Site

DNS and HTTPS: Diagnose an Unreachable Site

Answer 15 questions randomly selected from a bank of 40. Choose one best answer per question. Pass with 12 correct answers. Original professional practice, not an official certification exam.
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A reverse proxy terminates HTTPS and forwards HTTP internally. The app thinks every request is insecure and keeps redirecting. What should be reviewed?