Xamarin Forms iOS调用Firebase数据库遇505 HTTP版本不支持错误

问题现象 #

• 仅iOS端调用Firebase数据库时触发505 HTTP VersionNotSupported错误，Android端无此问题
• 错误信息：

  StatusCode HttpVersionNotSupported
  或
  ResponseData "<html>\r\n<head><title>505 HTTP Version Not Supported</title></head>\r\n<body>\r\n<center><h1>505 HTTP Version Not Supported</h1></center>\r\n<hr><center>nginx</center>\r\n</body>\r\n</html>\r\n"

相关代码 #

初始化Firebase客户端：

public FirebaseClient firebase = new FirebaseClient("https://myappname.firebaseio.com/");

数据获取逻辑：

return (await firebase
                .Child(ChildName)
                .OnceAsync<Userlogin>()).Select(item =>
                new Userlogin
                {
                    user_login = item.Object.user_login,
                    passwords = item.Object.passwords
                }).ToList();

错误堆栈跟踪 #

StackTrace  "  at System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode () [0x0001b] in /Library/Frameworks/Xamarin.iOS.framework/Versions/Current/src/Xamarin.iOS/external/corefx/src/System.Net.Http/src/System/Net/Http/HttpResponseMessage.cs:168 \n  at Firebase.Databa  at Firebase.Database.Http.HttpClientExtensions.GetObjectCollectionAsync[T] (System.Net.Http.HttpClient client, System.String requestUri, Newtonsoft.Json.JsonSerializerSettings jsonSerializerSettings) [0x00134] in <d27c522a7ecc437a9802ee0b4650ca23>:0 " 

补充说明 #

• plist文件已配置HTTPS请求地址
• 服务器提示请求不被接受的原因：使用HTTP或HTTP版本过时，需在iOS端实现更新HTTP版本或强制HTTPS
• 后续更新：问题已定位为项目HTTP设置问题，遗留反序列化问题将另行处理，本问题即将关闭

内容的提问来源于stack exchange，提问作者OnceUponATime