Post方式的Http流请求调用

public static class HttpRequestAction
{
    /// <summary>
    /// 发送http请求并返回响应
    /// </summary>
    /// <param name="url">请求目标</param>
    /// <param name="parameters">参数</param>
    /// <param name="timeout">过期时间</param>
    /// <param name="userAgent">用户地址IP</param>
    /// <param name="requestEncoding">请求编码</param>
    /// <param name="cookies"是否带有cookie></param>
    /// <returns>返回响应对象</returns>
    public static HttpWebResponse CreatePostHttpResponse(string url, string parameters, int? timeout, string userAgent, Encoding requestEncoding, CookieCollection cookies)
    {
        if (string.IsNullOrEmpty(url))
        {
            throw new ArgumentNullException("url");
        }
        if (requestEncoding == null)
        {
            throw new ArgumentNullException("requestEncoding");
        }
        HttpWebRequest request = null;
        //如果是发送HTTPS请求  
        if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
        {
            ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
            request = WebRequest.Create(url) as HttpWebRequest;
            request.ProtocolVersion = HttpVersion.Version10;
        }
        else
        {
            request = WebRequest.Create(url) as HttpWebRequest;
        }
        request.Method = "POST";
        request.ContentType = "application/json;charset=utf-8";
        if (timeout.HasValue)
        {
            request.Timeout = timeout.Value;
        }
        if (cookies != null)
        {
            request.CookieContainer = new CookieContainer();
            request.CookieContainer.Add(cookies);
        }
        //如果需要POST数据
        if (parameters != null)
        {
            StringBuilder buffer = new StringBuilder();
            buffer.Append(parameters);
            byte[] data = requestEncoding.GetBytes(buffer.ToString());
            using (Stream stream = request.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }
        }
        return request.GetResponse() as HttpWebResponse;

    }
}

[TestClass]
public class CouponAPIUT
{

    int _entId = 400060;
    string _loginAccount = "test";
    string _orderNo = "testorderno";
    SysEnums.BizProduct biz = SysEnums.BizProduct.DAT;

    [TestMethod]
    public void PreReceive()
    {
        var list = CouponAPIServiceUT.GetReceivableCouponsForTest();
        if (list == null || !list.Any())
        {
            Assert.IsFalse(1 == 1);
        }
        var dto = new APICommon.PreReceiveDTO
        {
            EntId = _entId,
            CouponCodes = list.First().CouponCode,
            LoginAccount = _loginAccount,
            BizProduct = biz.ToString(),
            OrderNo = _orderNo,
            OrderStatus = "YDZ",
            OrderAmount = 100
        };
        string targetUrl = "http://localhost:5550/CouponAPI/PreReceive"; // 
        string param = JsonConvert.SerializeObject(dto);
        var response = HttpRequestAction.CreatePostHttpResponse(targetUrl, param, 10000, null, Encoding.UTF8, null);
        var responseStream = response.GetResponseStream();
        StreamReader readerStream = new StreamReader(response.GetResponseStream());
        string result = readerStream.ReadToEnd();
        readerStream.Close();
    }
}