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Welcome to Katana

Katana is a flexible set of components for building and hosting OWIN-based web applications on .NET Framework.

This repo is the home for the Katana host, server, and middleware source code and documentation. Official releases of Katana components (including prerelease versions) can be found on

These products are developed by the ASP.NET team at Microsoft in collaboration with a community of open source developers.

See the list of Packages for information about individual components.

Documentation is available in the Wiki and overview of OWIN and Katana.

Source Code

To build and run the tests from a command prompt, run build.cmd (found in the root directory). Note: As part of building you may need to obtain NuGet packages from the public feed.

See startvs.cmd in the root directory to open the solution in Visual Studio.

Signed Rolling Builds

Rolling builds are available via an alternate NuGet feed. Rolling builds are meant for developers to try out new features or bug fixes ahead of an official prerelease or final build. Rolling builds are not supported for production use. The packages are available at:


There are lots of ways to contribute to the project, and we appreciate our contributors. You can contribute by reviewing and sending feedback on code commits, suggesting and trying out new features as they are implemented, submit bugs and help us verify fixes as they are checked in, as well as submit code fixes or code contributions of your own. Note that all code submissions will be rigorously reviewed and tested by the Katana team, and only those that meet an extremely high bar for both quality and design/roadmap appropriateness will be merged into the source.


For details on our planned features and future direction, please refer to our roadmap.