如何在C＃中使用HttpWebRequest传递header和Body值？

Question

我试图通过C＃中的HttpWebRequest类将API凭证数据发布到API，就像我必须在Header中传递“Content-Type：application / x-www-form-urlencoded” ，然后必须传递“grant_type：client_credentials，client_id：ruban123 ，client_secret：123456“在Body中获取响应/令牌（如API参考中所述）。

贝娄我附上了我做过的工作

    public class DataModel
    {
        public string grant_type { get; set; }
        public string client_id { get; set; }
        public string client_secret { get; set; }
    }
    static void Main(string[] args)
    {

        try
        {
            DataModel dm = new DataModel();
            dm.grant_type = "client_credentials";
            dm.client_id = "ruban123";
            dm.client_secret = "123456";

            var credentials = dm.grant_type + dm.client_id + dm.client_secret;

            #region Http Post
            string messageUri = "https://sampleurl.apivision.com:8493/abc/oauth/token";
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(messageUri);
            request.Headers.Add("Authorization", "Basic " + credentials);
            request.ContentType = "application/json";
            request.Method = "POST";
            using (var streamWriter = new StreamWriter(request.GetRequestStream()))
            {
                string jsonModel = Newtonsoft.Json.JsonConvert.SerializeObject(dm);
                streamWriter.Write(jsonModel);
                streamWriter.Flush();
                streamWriter.Close();
            }
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            Stream responseStream = response.GetResponseStream();

            string jsonString = null;

            using (StreamReader reader = new StreamReader(responseStream))
            {
                jsonString = reader.ReadToEnd();
                Console.WriteLine();
                reader.Close();
            }

            #endregion Http Post
        }

        catch (Exception ex)
        {
        }
    }[API REFERENCE][1]

Answer 1

这是正确的HttpWebRequest使用：

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(pathapi);
    request.Method = "POST";
    string postData = "grant_type=client_credentials&client_id=ruban123&client_secret=123456";
    ASCIIEncoding encoding = new ASCIIEncoding();
    byte[] bytes = encoding.GetBytes(postData);

    request.ContentType = "application/x-www-form-urlencoded";

    request.ContentLength = bytes.Length;
    Stream newStream = request.GetRequestStream();
    newStream.Write(bytes, 0, bytes.Length);

    HttpWebResponse response = request.GetResponse() as HttpWebResponse;

HttpWebRequest方法不相关。 看看这个问题设置HttpClient的授权标题

Answer 2

看起来你错过了HttpWebRequest的ContentLength属性的设置。 它应该是相同的字节数发送。

有关更多信息，请访问此链接：

https://docs.microsoft.com/en-us/dotnet/api/system.net.httpwebrequest.contentlength?view=netframework-4.8