.NET Http请求方法

public class HttpHelpers
{

    /// 

    /// Post请求
    /// 
    /// 链接地址
    /// 数据
    /// 超时时间（秒）
    /// 
    public static async Task PostAsync(string url, string jsonStr = "", IList headers = null, int timeout = 20)
    {
        try
        {
            using (var client = new HttpClient())
            {
                if (headers != null && headers.Any())
                {
                    foreach (var item in headers)
                    {
                        client.DefaultRequestHeaders.Add(item.Name, item.Value);
                    }
                }
                client.Timeout = new TimeSpan(0, 0, timeout);
                var content = new StringContent(jsonStr, Encoding.UTF8);
                content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
                var res = await client.PostAsync(url, content);
                return await res.Content.ReadAsStringAsync();
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }

    public static async Task PostAsync(string url, object reqObj, IList headers = null, int timeout = 20)
    {
        return await PostAsync(url, JsonConvert.SerializeObject(reqObj ?? string.Empty), headers, timeout);
    }



    /// 

    /// Post请求
    /// 
    /// 链接地址
    /// 数据
    /// 超时时间（毫秒）
    /// 
    public static string Post(string url, string jsonStr = "", int timeout = 5000, int type = 0)
    {
        try
        {
            HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(url);
            Encoding encoding = Encoding.UTF8;
            byte[] bs = Encoding.UTF8.GetBytes(jsonStr);
            string responseData = String.Empty;
            req.Method = "POST";

            req.ContentType = type == 0 ? "application/json; charset=utf-8" : "application/x-www-form-urlencoded";
            req.ContentLength = bs.Length;
            req.Timeout = timeout;

            using (Stream reqStream = req.GetRequestStream())
            {
                reqStream.Write(bs, 0, bs.Length);
                reqStream.Close();
            }

            using (HttpWebResponse response = (HttpWebResponse)req.GetResponse())
            {
                using (StreamReader reader = new StreamReader(response.GetResponseStream(), encoding))
                {
                    responseData = reader.ReadToEnd().ToString();
                }
                return responseData;
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }

    /// 

    /// POST同步请求方法
    /// 
    /// 请求的URL
    /// 请求的POST JOSN值
    /// 默认30S
    /// 

    public static string HttpPost(string url, string strJson, int timeout = 30000)
    {
        return HttpPost(url, strJson, null, timeout);
    }


    /// 

    /// POST同步请求方法
    /// 
    /// 请求的URL
    /// 请求的POST JOSN值
    /// 默认30S
    /// 
    public static string HttpPost(string url, string strJson, IList headers, int timeout = 30000)
    {
        try
        {
            HttpClient client = new HttpClient();
            if (headers != null && headers.Any())
            {
                foreach (var item in headers)
                {
                    client.DefaultRequestHeaders.Add(item.Name, item.Value);
                }
            }
            HttpContent content = new StringContent(strJson);
            content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json");
            Task res = client.PostAsync(url, content);
            if (res.Result.StatusCode == HttpStatusCode.OK)
            {
                string str = res.Result.Content.ReadAsStringAsync().Result;
                return str;
            }
            else
                throw new Exception(res.Result.Content.ReadAsStringAsync().Result);
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }


    /// 

    /// Get请求
    /// 
    /// 地址
    /// 超时时间（秒）
    /// 
    public static async Task GetAsync(string url, int timeout = 5)
    {
        try
        {
            var responseMessage = new HttpResponseMessage();
            using (var client = new HttpClient())
            {
                client.Timeout = new TimeSpan(0, 0, timeout);
                responseMessage = await client.GetAsync(url);
            }
            return await responseMessage.Content.ReadAsStringAsync();
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }

    /// 

    /// Get请求
    /// 
    /// 
    /// 
    public static string Get(string url)
    {
        return Get(url, null);
    }

    /// 

    /// Get请求
    /// 
    /// 
    /// 
    public static string Get(string url, IList headers)
    {
        string result = "";
        try
        {
            var httpclient = new HttpClient();
            if (headers != null && headers.Any())
            {
                foreach (var item in headers)
                {
                    httpclient.DefaultRequestHeaders.Add(item.Name, item.Value);
                }
            }

            var response = httpclient.GetAsync(url).Result;
            if (response.IsSuccessStatusCode)
            {
                Stream myResponseStream = response.Content.ReadAsStreamAsync().Result;
                StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
                result = myStreamReader.ReadToEnd();
                myStreamReader.Close();
                myResponseStream.Close();
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }
        return result;
    }

    public class RequestHeader
    {
        public string Name { get; set; }
        public string Value { get; set; }
    }

}