aspnetcore/samples/MvcSample/project.json

{
  "dependencies": {
    "Owin": "1.0",
    "Microsoft.Owin.Diagnostics": "2.0.2",
    "Microsoft.Owin": "2.0.2",
    "Microsoft.AspNet.Mvc": "",
  },
  "configurations": { 
	"net45": { 
       "dependencies": { 
           "System.Net.Http" : ""
       }
    }
  }
}