A practical guide to pre-warming multiple AWS Lambda execution environments for ASP.NET Web API applications to reduce cold starts. The technique involves adding a WarmupController that deliberately delays its first response by 10 seconds, forcing the Lambda service to spin up new execution environments for concurrent requests. A small .NET console app using HttpClient fires 100 parallel requests to the warmup endpoint, resulting in 100 pre-warmed execution environments ready before real traffic arrives.
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