Being lucky to develop a backend and a Xamarin.Forms clients on your own? Sooner or later you will have to debug the API calls and it might become painful. Unless, you will follow the next rules:
Configure your API URL to run on 127.0.0.1 instead of a localhost:
// .NET Core Web.Api example public static IWebHost BuildWebHost(string args) => WebHost.CreateDefaultBuilder(args) .UseStartup
() .UseUrls(“http://127.0.0.1:5001“) .Build();
Configure your Xamarin.Forms API consumer to have a conditional URL base:
string apiUrl = null; if (Device.RuntimePlatform == Device.Android) apiUrl = “http://10.0.2.2:5001/api“; else if (Device.RuntimePlatform == Device.iOS) apiUrl = “http://localhost:5001/api“; else throw new UnsupportedPlatformException();
The problem with Android emulator is that it maps 10.0.2.2 to 127.0.0.1, not to localhost. However, the iOS Simulator uses the host machine network.
That should be it! Happy debugging!