Xamarin表单图像未从远程URL加载

我有一个演示xamarin表单项目，该项目仅显示其图像源设置为远程URL的图像.但是问题是它适用于某些URL，不适用于其他URL.我从Google图片搜索中提取了随机图片链接，并整理了工作列表/非工作列表.对于这种奇怪行为的任何见解都将受到高度赞赏.

I have a demo xamarin forms project that simply displays an image with its image source set to a remote URL. But the problem is it works for some URL and does not for others. I have picked up random image links from google image search and compiled a list of the working / non-working ones. Any insight on this strange behavior is hugely appreciated.

预先感谢！

工作网址

• https://i.ytimg.com/vi/JTxPzXQ1Sso/maxresdefault .jpg

无效网址

• https://www.seminolehardrockhollywood.com/files/1637/Utilities-EventsCalendar-1250x450.jpg

http://melangesimsr.com.103-21-58-169.sdin-pp-wb3.webhostbox.net/Assets/UplaodedFiles/20171122090840812.png

https://www.chicagotraveler .com/sites/default/files/concerts-chicago-big-1.jpg

XAML文件

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:XamarinImageTest"
             x:Class="XamarinImageTest.MainPage"
             BackgroundColor="#000000">

    <ContentPage.Content>
        <Image Source="https://i.ytimg.com/vi/JTxPzXQ1Sso/maxresdefault.jpg" 
               VerticalOptions="Fill"
               HorizontalOptions="Fill"></Image>
    </ContentPage.Content>
</ContentPage>