Hidden RestSharp Serialization Bug Caused Inconsistent Behavior Across Dev Environments
A development team encountered a puzzling bug where the same codebase behaved differently across two groups of virtual machines, with no obvious infrastructure differences to explain it. After ruling out VM configurations, network settings, and runtime versions, the team shifted focus to the application's HTTP layer and examined the HTTP client itself. They discovered the root cause was an outdated version of RestSharp that relied on SimpleJson, a legacy built-in serializer, which introduced subtle serialization inconsistencies. RestSharp had officially dropped SimpleJson in version 107, migrating to System.Text.Json due to known quirks in the older library. Updating away from the legacy RestSharp implementation resolved the inconsistent behavior across all environments.
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