Dev helper for bypassing SSL connections to localhost on Android

DevHttpsConnectionHelper.cs

// forked from https://gist.github.com/Eilon/49e3c5216abfa3eba81e453d45cba2d4
// by https://gist.github.com/Eilon
// modified by https://gist.github.com/EdCharbeneau
using System.Net.Security;
public class DevHttpsConnectionHelper
{
    public DevHttpsConnectionHelper(int sslPort)
    {
        DevServerRootUrl = new UriBuilder("https", DevServerName, sslPort).Uri.ToString();
#if WINDOWS
        LazyHttpClient = new Lazy<HttpClient>(() => new HttpClient());
#else 
        LazyHttpClient = new Lazy<HttpClient>(() => new HttpClient(GetPlatformMessageHandler()));
#endif
    }

    public string DevServerName =>
#if WINDOWS
        "localhost";
#elif ANDROID
        "10.0.2.2";
#else
        throw new PlatformNotSupportedException("Only Windows and Android currently supported.");
#endif

    public string DevServerRootUrl { get; }

    private Lazy<HttpClient> LazyHttpClient;
    public HttpClient HttpClient => LazyHttpClient.Value;

    public HttpMessageHandler GetPlatformMessageHandler()
    {
#if ANDROID
        var handler = new CustomAndroidMessageHandler();
        handler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) =>
        {
            if (cert != null && cert.Issuer.Equals("CN=localhost"))
                return true;
            return errors == SslPolicyErrors.None;
        };
        return handler;

#else
        throw new PlatformNotSupportedException("Only Windows and Android currently supported.");
#endif
    }

#if ANDROID
    internal sealed class CustomAndroidMessageHandler : Xamarin.Android.Net.AndroidMessageHandler
    {
        protected override Javax.Net.Ssl.IHostnameVerifier GetSSLHostnameVerifier(Javax.Net.Ssl.HttpsURLConnection connection)
            => new CustomHostnameVerifier();

        private sealed class CustomHostnameVerifier : Java.Lang.Object, Javax.Net.Ssl.IHostnameVerifier
        {
            public bool Verify(string hostname, Javax.Net.Ssl.ISSLSession session)
            {
                return
                    Javax.Net.Ssl.HttpsURLConnection.DefaultHostnameVerifier.Verify(hostname, session)
                    || hostname == "10.0.2.2" && session.PeerPrincipal?.Name == "CN=localhost";
            }
        }
    }
#endif
}

DevHttpsConnectionHelperExtensions.cs

// by https://gist.github.com/EdCharbeneau
public static class DevHttpsConnectionHelperExtensions
{
    /// <summary>
    /// Configures HttpClient to use localhost or 10.0.2.2 and bypass certificate checking on Android.
    /// </summary>
    /// <param name="sslPort">Development server port</param>
    /// <returns>The IServiceCollection</returns>
    public static IServiceCollection AddDevHttpClient(this IServiceCollection services, int sslPort)
    {
        var devSslHelper = new DevHttpsConnectionHelper(sslPort);
        var http = devSslHelper.HttpClient;
        http.BaseAddress = new Uri(devSslHelper.DevServerRootUrl);
        services.AddScoped(sp => http);
        return services;
    }
}

MauiProgram.cs

#if DEBUG
            builder.Services.AddDevHttpClient(7030);
#else
    builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri("Server Address") });
#endif