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I have checked that in the web response the server is IIS when I deploy ASP.NET5 to azure web app, so I guess the IIS platform handler is used to redirect it to Kestrel. So I am wondering if it is possible to run directly on Kestrel, and what benefits/drawbacks will that have (probably regardless if it's in Azure or not). I suppose it will be a bit faster since IIS will be excluded from the pipline, but it should not be too much overhead I suppose...
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The main difference between IIS and Kestrel is that Kestrel is a cross-platform server. It runs on Linux, Windows, and Mac, whereas IIS is Windows-specific. Another essential difference between the two is that Kestrel is fully open-source, whereas IIS is closed-source and developed and maintained only by Microsoft.
YES. When we use the InProcess Hosting model, then the application is hosted inside the IIS worker process i.e. w3wp.exe in the case of IIS and iisexpress.exe in the case of IIS Express. That means the Kestrel Web Server is not used with the InProcess hosting model.
Kestrel is the web server that's included and enabled by default in ASP.NET Core project templates.
On Azure Web App, you cannot bypass IIS.
But in the general case, you can definitely run Kestrel directly. It is after all just dnx web and it's exactly what the XPlat version (Linux, OSX) will end-up using (almost).
If you are OK with the "lose" points, I would still go and host your Kestrel behind a reverse proxy or an NGINX server. Kestrel was made to be "production ready" but it's not NGINX or IIS.
It will not keep itself alive as far as I know.
If I missed anything, please let me know.
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