C# 调用HTTPClient.PostAsync时设置授权/内容类型标题

在使用简单HTTPClient时，在哪里可以设置REST服务调用的头

我有：

HttpClient client = new HttpClient();
var values = new Dictionary<string, string>
{
    {"id", "111"},
    {"amount", "22"}
};
var content = new FormUrlEncodedContent(values);
var uri = new Uri(@"https://some.ns.restlet.uri");

var response = await client.PostAsync(uri, content);
var responseString = await response.Content.ReadAsStringAsync();

我应该做以下事情吗

client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Authorization", "NLAuth nlauth_account=5731597_SB1, nlauth_email=xxx@xx.com, nlauth_signature=Pswd1234567, nlauth_role=3","Content-Type":"application/json");

---

添加标题的方法如下所示：

HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", "Your Oauth token");

或者，如果您需要一些自定义标题：

HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Add("HEADERNAME", "HEADERVALUE");

这个答案已经有了答案，请参见下文：

更新

似乎你在添加两个headerr；授权和内容类型

string authValue = "NLAuth nlauth_account=5731597_SB1,nlauth_email=xxx@xx.com, nlauth_signature=Pswd1234567, nlauth_role=3";
string contentTypeValue = "application/json";

client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(authValue);
client.DefaultRequestHeaders.Add("Content-Type", contentTypeValue);

---

我知道这是前一段时间提出的，但胡安的解决方案对我不起作用

（另外，我很确定这个问题是重复的。）

最终有效的方法是将HttpClient与和一起使用

还请注意，这是使用Newtonsoft的

    using System;
    using System.Net.Http;
    using System.Text;
    using System.Threading.Tasks;
    using System.Net.Http.Headers;
    using Newtonsoft.Json;

    namespace NetsuiteConnector
    {
        class Netsuite
        {

            public void RunHttpTest()
            {
                Task t = new Task(TryConnect);
                t.Start();
                Console.WriteLine("Connecting to NS...");
                Console.ReadLine();
            }

            private static async void TryConnect()
            {
                // dummy payload
                String jsonString = JsonConvert.SerializeObject(
                    new NewObj() {
                        Name = "aname",
                        Email = "someone@somewhere.com"
                    }
                );

                string auth = "NLAuth nlauth_account=123456,nlauth_email=youremail@somewhere.com,nlauth_signature=yourpassword,nlauth_role=3";

                string url  = "https://somerestleturl";
                var uri     = new Uri(@url);

                HttpClient c = new HttpClient();
                    c.BaseAddress = uri;
                    c.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", auth);
                    c.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                HttpRequestMessage req = new HttpRequestMessage(HttpMethod.Post, url);
                req.Content = new StringContent(jsonString, Encoding.UTF8, "application/json");

                HttpResponseMessage httpResponseMessage = await c.SendAsync(req);
                httpResponseMessage.EnsureSuccessStatusCode();
                HttpContent httpContent = httpResponseMessage.Content;
                string responseString = await httpContent.ReadAsStringAsync();

                Console.WriteLine(responseString);
            }
        }

        class NewObj
        {
            public string Name { get; set; }
            public string Email { get; set; }
        }
    }

---

如果您使用的是HttpClientFactory，那么其他答案就不起作用，为什么应该这样做。对于HttpClientFactory，HttpMessages从池中重用，因此应该为每个请求中使用的头保留设置默认头

如果您只想添加内容类型标题，可以使用备用的

PostAsJsonAsync

或

PostAsXmlAsync

var response = await _httpClient.PostAsJsonAsync("account/update", model);

不幸的是，我没有比这更好的添加授权头的解决方案

_httpClient.DefaultRequestHeaders.Add(HttpRequestHeader.Authorization.ToString(), $"Bearer {bearer}");

---

您正在寻找这个

client.DefaultRequestHeaders.Add（“Accept”，“application/json”）您希望添加哪些标题？有不同的方法添加不同的标题，例如Accept header
HttpClient.DefaultRequestHeaders.Accept
可能与See重复。我已用需要添加的标题更新了问题正文。我想我应该使用授权头？在这里查看Alaa Masoud的答案：了解更多详细信息。
_httpClient.DefaultRequestHeaders.Add(HttpRequestHeader.Authorization.ToString(), $"Bearer {bearer}");