Posted on Oct 1 • AI-assisted ## Project the Response, Not the Cache A response can be correct for one caller and still leave the application in a worse state for everyone who follows. This is an easy trap in ASP.NET Core when a result filter, formatter, or middleware needs to change a few fields before a response leaves the server. Localization is a useful example: a DTO contains source-language text, the current request asks for another language, and the pipeline replaces selected strings before serialization. The first response looks right. The implementation may even be pleasantly small.…