After further investigating this issue, this was caused by the reverse proxy that I set up in front of FusionAuth.
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Best posts made by ric.alex.m
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RE: Error 500 on startupposted in General Discussion
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RE: Error 500 on startupposted in General Discussion@dan I am using caprover as PaaS, and it has NGINX fully integrated. It's only happening on their latest version. I already raised an issue with them (https://github.com/caprover/caprover/issues/1035). I tried to reconfigure their proxy manually but couldn't get it to work. I just rolled it back to their earlier version.