Solution for Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED

HttpClientHelper.cs

using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Http;
using System.Text;

namespace MyXamarinNativeApp.Shared.Helpers
{
    public class HttpClientHelper
    {
        public static HttpClient Create(CookieContainer cookieContainer = null)
        {
            HttpClient http;

#if __ANDROID__
            var handler = new Xamarin.Android.Net.AndroidClientHandler();
            if (cookieContainer != null)
                handler.CookieContainer = cookieContainer;
            http = new HttpClient(handler);
#else
            var handler = new HttpClientHandler();
            if (cookieContainer != null)
                handler.CookieContainer = cookieContainer;
            http = new HttpClient(handler);
#endif

            return http;
        }

        public static HttpClientHandler CreateHandle()
        {
            HttpClientHandler handler;

#if __ANDROID__
            handler = new Xamarin.Android.Net.AndroidClientHandler();
#else
            handler = new HttpClientHandler();
#endif
            return handler;
        }
    }
}

Here's a small refactor for your proposal :

public static HttpClient Create(CookieContainer cookieContainer = null)
{
    return new HttpClient(HttpClientHelper.CreateHandle(cookieContainer));
}

public static HttpClientHandler CreateHandle(CookieContainer cookieContainer = null)
{
    HttpClientHandler handler;

#if __ANDROID__
    handler = new Xamarin.Android.Net.AndroidClientHandler();
#else
    handler = new HttpClientHandler();
#endif

    if (cookieContainer != null)
        handler.CookieContainer = cookieContainer;
    return handler;
}