将Http标头添加到HttpClient

创建一个

HttpRequestMessage

GET

SendAsync

GetAsync

var client = new HttpClient();var request = new HttpRequestMessage() {    RequestUri = new Uri("http://www.someURI.com"),    Method = HttpMethod.Get,};request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("text/plain"));var task = client.SendAsync(request)    .ContinueWith((taskwithmsg) =>    {        var response = taskwithmsg.Result;        var jsonTask = response.Content.ReadAsAsync<JsonObject>();        jsonTask.Wait();        var jsonObject = jsonTask.Result;    });task.Wait();