如何让.net HttpClient使用http 2.0？

我有一个托管在 IIS 10 (windows server 2016) 上的 asp.net Web api。当我做一个GET从 Microsoft Edge 浏览器请求此内容，我看到HTTP 2.0用于 IIS 日志

2015-09-20 21:57:59 100.76.48.17 GET /RestController/Native - 443 - 73.181.195.76 HTTP/2.0 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/42.0.2311.135+Safari/537.36+Edge/12.10240 - 200 0 0 7299

然而，当一个GET请求是通过.net 4.6 客户端 https://msdn.microsoft.com/en-us/library/system.net.http.httpclient(v=vs.118).aspx如下，

using (var client = new HttpClient())
{
    client.BaseAddress = new Uri("https://myapp.cloudapp.net/");

    HttpResponseMessage response = await client.GetAsync("RestController/Native");
    if (response.IsSuccessStatusCode)
    {
        await response.Content.CopyToAsync(new MemoryStream(buffer));
    }
}

我看到以下内容HTTP 1.1登录服务器日志

2015-09-20 20:57:41 100.76.48.17 GET /RestController/Native - 443 - 131.107.160.196 HTTP/1.1 - - 200 0 0 707

如何让 .net 客户端使用 HTTP/2.0 ？

1.确保您位于latest的版本Windows 10.

2.安装WinHttpHandler:

Install-Package System.Net.Http.WinHttpHandler

3.扩展WinHttpHandler to add http2.0支持：

public class Http2CustomHandler : WinHttpHandler
{
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)
    {
        request.Version = new Version("2.0");
        return base.SendAsync(request, cancellationToken);
    }
}

4.将上面的处理程序传递给Http客户端构造函数

using (var httpClient = new HttpClient(new Http2CustomHandler()))
{
      // your custom code
}