Is Kestrel using a single thread for processing requests like Node.js?

Updated for ASP.Net Core 2.0. As pointed by poke, the server has been split between hosting and transport, where libuv belongs to the transport layer. The libuv ThreadCount has been moved to its own LibuvTransportOptions and they are set separately in your web host builder with the UseLibuv() ext method: If you check the LibuvTransportOptions … Read more

Read environment variables in ASP.NET Core

Your problem is spaces around =. This will work (attention to space before closing quote): Console.WriteLine(Environment.GetEnvironmentVariable(“ASPNETCORE_ENVIRONMENT “)); The space after ASPNETCORE_ENVIRONMENT in this code is not a typo! The problem in the question was having extra space (in SET…), so you must use the same space in GetEnvironmentVariable(). As noted by Isantipov in a comment, … Read more

How do I get the kestrel web server to listen to non-localhost requests?

The default configuration file used by Kestrel server is hosting.json. The name was changed multiple times in different beta versions. If you use now project.json with the following “command” section “commands”: { “web”: “Microsoft.AspNet.Server.Kestrel” } then during starting the server from the command line by dnx web the file hosting.json will be read. The file … Read more

Why does aspnet core start on port 80 from within Docker?

The microsoft/aspnetcore-build container builds on top of the microsoft/aspnetcore container. The dockerhub page for that says: A note on ports This image sets the ASPNETCORE_URLS environment variable to http://+:80 which means that if you have not explicity set a URL in your application, via app.UseUrl in your Program.cs for example, then your application will be … Read more

What is Kestrel (vs IIS / Express)

I’d like to offer an alternative answer, with some history, so that you might understand why Kestrel comes, even if you only use Windows and IIS. At the very beginning of ASP.NET development before year 2000, clearly Microsoft created two pieces to host ASP.NET WebForms apps, Cassini, later became ASP.NET Development Server in Visual Studio. … Read more

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