Android emulator port forwarding results in ERR_EMPTY_RESPONSE - xamarin.forms

Question

My scenario is as follows. I have an Android Emulator which is hosting an EmbedIO web server through an App. When I try to access the URL to the web server from the host machine's (Mac) browser I receive ERR_EMPTY_RESPONSE error.
I have issued the following port forwarding commands through ADB:
adb forward tcp:8080 tcp:8080
In the browser I am navigating to: http://localhost:8080/api/ChangeBackGround
and the Android emulator web server is listening on: http://10.0.2.16:8080/api/ChangeBackGround
Here is the code that starts the web server in the Xamarin Forms App (runs on Android Emulator):
public static class WebServerFactory
{
public static WebServer CreateWebServer<T>(string url, string baseRoute)
where T : WebApiController, new()
{
var server = new WebServer(url)
.WithWebApi(baseRoute, api => api.WithController<T>());
// Listen for state changes.
server.StateChanged += (s, e) => Debug.WriteLine($"WebServer New State - {e.NewState}");
return server;
}
}
public class EventController : WebApiController
{
[Route(HttpVerbs.Get, "/ChangeBackGround")]
public void ChangeBackGround()
{
Device.BeginInvokeOnMainThread(() =>
{
App.Current.MainPage.BackgroundColor = Color.Green;
});
}
}
public partial class App : Application
{
public App()
{
InitializeComponent();
MainPage = new MainPage();
}
private WebServer _WebServer;
protected override void OnStart()
{
var localIPAddress = GetLocalIPAddress();
var url = $"http://{localIPAddress}:8080";
Task.Factory.StartNew(async () =>
{
_WebServer = WebServerFactory.CreateWebServer<EventController>(url, "/api");
await _WebServer.RunAsync();
});
((MainPage)MainPage).Url = url;
}
private string GetLocalIPAddress()
{
var IpAddress = Dns.GetHostAddresses(Dns.GetHostName()).FirstOrDefault();
if (IpAddress != null)
return IpAddress.ToString();
throw new Exception("Could not locate IP Address");
}
protected override void OnSleep()
{
}
protected override void OnResume()
{
}
}
The scenario currently works on the iOS simulator and an Android physical device. But I always get ERR_EMPTY_RESPONSE even when I've setup the port forwarding rules.
Any help would be much appreciated.

Answer 1

Please first make sure your android emulator could connect internet properly.
If the problem perisist, you can try the following methods:
Method 1:
1.start your Command prompt by runing as an admistrator;
2.Run the following commands in sequence：
netsh int ip reset c:\resetlog.txt
netsh winsock reset
ipconfig /flushdns
exit
Method 2: (If method 1 didn't work,try modthod 2)
Open your Control Panel -->NetWork and Internet-->Network and Sharing Center-->Change adapter settings-->right click Ethenet and click Properties-->select Internet Protocol 4-->click Properties -->using the following NDS server addresses
Fill in the following configuration：
Preferred NDS Server: 1.1.1.1
Alternate NDS Server: 1.0.0.1
Method 3: (If above methods didn't work,try modthod 3)
Open Settings in your PC-->Open NetWork and Internet-->click Nnetwork reset-->press Reset Now
Note:
For more details, you can enter keywords How to fix "ERR_EMPTY_RESPONSE" Error [2021] in your browser and then you will find relative tutorail.

Answer 2

You should have you service listening on either one of these IPs:
127.0.0.1: The emulated device loopback interface (preferred, I don't think you have reasons to use a different one)
10.0.2.15: The emulated device network/ethernet interface
See https://developer.android.com/studio/run/emulator-networking#networkaddresses