CorsStudy/CorsServer/CorsServer.WebApi31/appsettings.json

{
  "urls": "http://*:5000",
  "CORS": {
    "Origins": ["*"],
    "Methods": [ "*" ],
    "Headers": [ "*" ],
    "ExposedHeaders": ["x-custom-error"]
  },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*"
}