C#将Accept标头添加到HttpClient

这两个电话有什么区别？我的最终目标是通过网络 Accept: application/json发送,而不是附加到一些默认的其他MIME类型集.

HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Add("Accept", "application/json");

与

client.DefaultRequestHeaders
  .Accept
  .Add(new MediaTypeWithQualityHeaderValue("application/json"));

我的CLR是.NET Core 2.0.

嗅探电线显示没有区别:

# just .Add("Accept"...
~ % nc -l 8000
GET / HTTP/1.1
Connection: Keep-Alive
Accept: application/json
[...]

# with MediaTypeWithQualityHeaderValue
~ % nc -l 8000
GET / HTTP/1.1
Connection: Keep-Alive
Accept: application/json
[...]

DefaultRequestHeaders