c# Post请求

public string PostLogin(string postUrl, string referUrl, string data)
{
string result = "";
try
{
//命名空间System.Net下的HttpWebRequest类
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(postUrl);
//参照浏览器的请求报文 封装需要的参数 这里参照ie9
//浏览器可接受的MIME类型
request.Accept = "text/plain, */*; q=0.01";
//包含一个URL，用户从该URL代表的页面出发访问当前请求的页面
request.Referer = referUrl;
//浏览器类型，如果Servlet返回的内容与浏览器类型有关则该值非常有用
request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E)";
request.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";
//请求方式
request.Method = "POST";
//是否保持常连接
request.KeepAlive = true;
request.Headers.Add("Accept-Encoding", "gzip, deflate");
request.Headers.Add("Accept-Language", "zh-CN,zh;q=0.8");
request.Headers.Add("X-Requested-With", "XMLHttpRequest");
//表示请求消息正文的长度
request.ContentLength = data.Length;
request.CookieContainer = cookconta;
Stream postStream = request.GetRequestStream();
byte[] postData = Encoding.UTF8.GetBytes(data);
//将传输的数据，请求正文写入请求流
postStream.Write(postData, 0, postData.Length);
postStream.Dispose();
//响应
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
//判断响应的信息是否为压缩信息 若为压缩信息解压后返回
if (response.ContentEncoding == "gzip")
{
MemoryStream ms = new MemoryStream();
GZipStream zip = new GZipStream(response.GetResponseStream(), CompressionMode.Decompress);
byte[] buffer = new byte[1024];
int l = zip.Read(buffer, 0, buffer.Length);
while (l > 0)
{
ms.Write(buffer, 0, l);
l = zip.Read(buffer, 0, buffer.Length);
}
ms.Dispose();
zip.Dispose();
result = Encoding.UTF8.GetString(ms.ToArray());
}
return result;
}
catch (Exception)
{

throw;
}
}