The original title is "Propagating CancellationToken in ASP.NET Core to reduce wasted server work"

Short summary

A developer shares how adding CancellationToken propagation across all layers of an ASP.NET Core API — controllers, services, repositories, and EF Core operations — prevents wasted work when clients disconnect mid-request. Without it, servers continue executing database queries and external API calls even after the client is gone. The fix is straightforward: pass the token through every async method so the server stops processing abandoned requests automatically, reducing CPU and memory usage under load.

• •Pass CancellationToken through every async layer to stop processing abandoned requests
• •Without tokens, servers waste resources on responses no client will receive
• •Small code change yields meaningful scalability and resource-efficiency gains

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