Kestrel is the default, cross-platform web server for ASP.NET Core. It is lightweight and built for high performance, handling many concurrent connections. It supports HTTP/1.1, HTTP/2 and HTTP/3.
Kestrel can face the internet on its own, or sit behind a reverse proxy such as IIS, Nginx or Apache. Both setups are supported. A proxy adds a layer of security and configuration in production. It can also handle HTTPS certificates and load balancing, and let several apps share one IP address and port.
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