Create a WEBAPI project that uses Owin to host based on an empty project template

Start by creating an empty Web project, as shown in:

After the project is successfully created, install the following three package.

Install-package Microsoft.aspnet.webapi-version 5.2.2
Install-package Microsoft.aspnet.webapi.owin-version 5.2.2
Install-package Microsoft.owin.host.systemweb-version 3.0.0

Create Owin Startup class

1 usingSystem;2 usingSystem.Threading.Tasks;3 usingMicrosoft.owin;4 usingOwin;5 usingSystem.Web.Http;6 7[Assembly:owinstartup (typeof(Firstowinwebapi.startup))]8 9 namespaceFirstowinwebapiTen { One      Public classStartup A     { -          Public voidConfiguration (Iappbuilder app) -         { thehttpconfiguration config =Newhttpconfiguration (); -  -             //Web API Routes - CONFIG. Maphttpattributeroutes (); +  -             //webapiconfig.register (config); +  A app. Usewebapi (config); at         } -     } -}

Create an API Controller.

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Linq;4 usingSystem.Net;5 usingSystem.Net.Http;6 usingSystem.Web.Http;7 8 namespacefirstowinwebapi.controllers9 {Ten[Routeprefix ("Api/helloworld")] One      Public classHelloworldcontroller:apicontroller A     { -[Route ("")] -          Publicihttpactionresult Post () the         { -  -             returnok<string> ("Hello World"); -  +         } -  +     } A}

F5 run, Access API using Postman

Some other Owin middleware packages:

Install-package Microsoft.aspnet.webapi-version 5.2.2

Install-package Microsoft.aspnet.webapi.owin-version 5.2.2

Install-package Microsoft.owin.host.systemweb-version 3.0.0

Install-package Microsoft.owin.cors-version 3.0.0

Install-package Microsoft.owin.security.oauth-version 3.0.0

Install-package Microsoft.owin.security.jwt-version 3.0.0

Install-package system.identitymodel.tokens.jwt-version 4.0.0

Install-package Thinktecture.IdentityModel.Core Version 1.2.0

Install-package Microsoft.aspnet.identity.owin-version 2.0.1

Install-package Microsoft.aspnet.identity.entityframework-version 2.0.1

Create a WEBAPI project that uses Owin to host based on an empty project template