aspnetcore/src/HttpSysServer/samples/SelfHostServer/Properties/launchSettings.json

{
  "profiles": {
    "SelfHostServer": {
      "commandName": "Project",
      "launchBrowser": true,
      "launchUrl": "http://localhost:5000/",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    }
  }
}